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Why some notes in the piano are written the same for the left and right hand ?

What is the purpose of this ? And how do we play them ?

Do we just choose one hand to play them or do we play them really in both hands which is pretty hard and not comfortable ? Here is an example of what I'm talking about See the last two notes Si Si are both wrote in the left and right hand .

  • In the end, you play the notes in such a way as to bring out your understanding of the music. This is always so. Fingering is partly a practical and technical decision, and partly a personal and musical one. They both go together: if you choose a fingering that tangles up your fingers, you won't be able to play the notes, so you won't be able to bring out the music. However, if your only criterion is to understand what fingering you are "supposed" to use, then you will suppress your personal expression, and still won't be able to bring out the music. Find your own balance. – BobRodes Jun 16 '15 at 17:05
  • Related: music.stackexchange.com/q/4670/28 – Matthew Read Sep 11 '15 at 1:48
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The main reason for writing a unison like this has little to do with fingering and everything to do with the music's structure. Unisons in keyboard music quite obviously use the same key, so their point is to show how the voice leading works. In the example above, they show that two lines in contrary motion meet at the tonic.

As I've mentioned in my comments, a rest could be substituted for one of the notes in a unison, but your understanding of that line's phrasing would change, and hence your presentation of the phrasing might very well change as well (for example, by shortening the last note before the rest so that it doesn't give the impression of meeting the other line in a unison).

It is no means unusual that one of the notes in a unison may have a shorter note value than the other. This may be dictated by motivic or thematic requirements. I'll give an example from J. J. Froberger's Ricercar I (FbWV 401).

FR 1

In this excerpt, the first bar-and-a-half conclude the previous section, and a new one starts at the end of m.87 with a statement of the ricercar's subject (in blue) matched with a short second subject/motif (in green). Momentary unisons are marked red. The first one is a bit unusual in that the entries of the unison are staggered. You would normally play this unison as a crochet before the bar line, followed by a dotted minim after the bar line. (On an organ, it would be hypothetically possible to play both voices separately on different manuals, although I doubt a performer would - the inner voices shift between hands, and there isn't really any tidy spot to bring both hands back together on the same manual.)

The second unison is pretty straightforward: you would hold the F for the complete measure.

But you should be able to see why Froberger wrote it this way: the individual voices make sense as written, and you want to try to give an impression of those lines as written, even though you will need to fake it a bit.

Here's the complete ricercar (unfortunately in a MIDI rendition). It is a really lovely piece of music, IMHO.

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Just play them with one hand. The reason for writing this is so you can clearly see where both lines go.

  • 3
    +1, because in this case the simplest answer is the best. When we write unisons in keyboard music, it is because the lines are important in the piece, and the performer needs to know where the unison is coming from, and where it is going. It is by no means unusual to see unisons formed by different note values, i.e., one voice holds the note while the other moves away early. – user16935 Jun 5 '15 at 16:08
  • @Patrx2 - your last sentence may well be true, but what would be the point in having two different note values simultaneously for the same note? – Tim Jun 5 '15 at 17:20
  • @Tim Maybe the chosen answer will give you what you want – Was.Francis Jun 5 '15 at 17:46
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    @Tim, the point is in how you phrase the lines. You will very likely phrase a line that has a rest in it differently than one that substitutes a unison for the rest, even if the Notenbild is effectively the same for both versions. You will do this because your understanding of what constitutes the line is different. Consider, for instance, the fairly normal situation in contrapuntal music where the momentary unison is part of a subject or motif. – user16935 Jun 5 '15 at 18:42
  • @Patrx2 Can you write an organized answer so I can choose it as the accepted answer ? – Was.Francis Jun 5 '15 at 19:24
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Another reason for notating the same note on both hands is that while both notes would represent the same key on a piano keyboard, it's possible the piece of music might be performed on something other than a solo piano. Some keyboard instruments such as organs and harpsichords are constructed with more than one manual (keyboard), and some musicians stack synthesizer keyboards so as to allow two keyboards to be played simultaneously (using one hand for each). Additionally, one or more of the parts on a piano score may sometimes be played by other instruments in addition to or instead of the piano. Even if a piano would not be able to play the B3 in the right hand and left hand as separate notes, writing the note in both parts lets those who play instruments that could perform both notes simultaneously know that they should do so.

  • That's not always the case in keyboard music, though. To play voices on different keyboards or manuals requires that the voices can be separated cleanly between the hands. If an inner voice needs to be shared between the hands (and that happens a lot), then you either need to find a logical spot to bring both hands back together on a single manual before the voice starts crossing between hands, or you need to use a single manual from the start. (more...) – user16935 Jun 5 '15 at 21:26
  • My Froberger example illustrates the difficulty quite well. Hypothetically you could play the bass from m.88ff on the Pedal division of an organ, and the tenor and alto on separate manuals, say Swell and Choir, and that would work fine until m.99. The alto D in m.99, however, needs to be in the left hand because of the distance between it and the descant's high G, but, because of the line's phrasing, the logical spot to change manuals is following the rest in the alto (i.e., the quaver G). – user16935 Jun 5 '15 at 21:27
  • @Patrx2: Not all keyboard pieces can be played effectively using two differently-voiced manuals with one hand on each, but the one-measure excerpt from the OP shows nothing that would be problematic. I would think that kind of duplication would be most common in cases where it would be useful. – supercat Jun 5 '15 at 21:36
  • No argument, but it really only works when you have either two voices or straight melody with accompaniment. Anything more complex, and life can get... interesting, and "more complex" is anything but rare. I do occasionally write for separate manuals, but I build the manual changes right into the music. – user16935 Jun 5 '15 at 21:48
  • @Patrx2: Perhaps a distinction should be made between music which is written specifically for a piano, versus music which is "condensed" into a form that may be played by a pianist or by one or more performers on other instruments. In the latter situation, an editor may sometimes notate things in a fashion that's less than ideal for the pianist, but which would benefit other performers. – supercat Jun 6 '15 at 17:22
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Actually, I think the main reason for this is simply due to proper notation of the voices, rather than having to do with which hand plays the note. To elaborate, both notes rest on the same physical key on the keyboard, however it is meant to convey to the performer that the lower voice and upper voice both cadence on B.

I really don't believe this was done to a) encourage either hand to play it or b) easier to read.

My answer is obviously in agreement with Patrx2's comments.

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There are probably a couple reasons.

  1. Continuity in the score. The music looks better and is easier to read when concurrent notes are listed on both staves.
  2. Flexibility. Some people will prefer playing the notes with the right hand, others will prefer playing them with the left, and some might even like trying to play them with both hands. This leaves the performer with options. Also, this heightens the importance of playing with the correct hand in scores which do require a certain hand to play a note. If all scores arbitrarily assigned a hand to play the notes, then ones which had concrete reasons for choosing a hand would be hold less significance.
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I'm accustomed to re-instrumenting pieces, and that unison would behave differently from the rest under the obvious re-instrumenting. Start thinking two horns rather than two hands and it suddenly becomes clear. (When playing this piece as horns, we'd have to deduce the bass clef melody line and drop the other notes from chords.)

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