# How to play this rhythm in Beethoven's Moonlight Sonata? as a 4/3 polyrythm or as 6/16?

First of all, I apologize if I do not get it right with the terminology.

In this sonata of Beethoven in bar 6, there is the 3/8 being played and then at the 4rth 3/8 part, the melody enters above - with G#. I could not figure out from listening if this is a polyrhythm - being notated as 4/16 (a dotted quarter note +1/16) or is it like 6/16 (each 8th is like 2/16 so I play a dotted 8th = 5/16 and the last note enters in the 6/16? and if this is so don't they have the same notation? I am confused...

i hope you can understand what i am asking. :)

• It's a kind of 4:3 polyrythm. You can look at this question: music.stackexchange.com/questions/6986/… ; it considers exactly the same place in the sonata, so the answers could be helpful to you. – Ramillies Oct 31 '19 at 10:27
• This is weird. I don't understand the question yet others seem to have no problem. Bar 6 appears to have the same rhythm as the all the rest so why the talk of polyrythms? What am I missing? – PeterJ Nov 1 '19 at 14:01

The root of the question comes from the incorrect assumption that in Beethoven's time (and earlier) the notation for dotted rhythms was performed strictly according to the math. The math was certainly "strict" in the sense of showing the mathematically correct number of beats in the bar, but that was not necessarily how they were played.

A single-dotted note could represent anything from modern "light swing" (i.e. less than 2/3 of a beat followed by more than 1/3, but not an equal division of 1/2 + 1/2) up to even 15/16 followed by 1/16 in a slow tempo (i.e. a triple-dotted note, in modern notation)

There are two practical options for playing these particular dotted notes: either 2/3 + 1/3, or 5/6 + 1/6. The choice really depends on the tempo for the whole movement - if it is too low, 2/3 + 1/3 sounds a bit lame and "dragging", and if it is too fast, 5/6 + 1/6 sounds like a little "click" at the end of the beat rather than something musically significant.

Of course if you are playing using rubato, the beat division doesn't have to be "mathematical" anyway - just play it the however you want it to sound.

Composers and music copyists didn't like writing "triplets" consisting of a quarter note plus a half note, because it meant that some sort of bracket or slur was essential to show that the notation was a triplet. when some of the notes in the triplet did not have beams. A dotted eight plus a 16th, beamed together, was simpler to write, and everybody at the time understood what it meant.

• I don't think that Beethoven meant a 2/3+1/3 division here, or else he would have written it that way and put the whole thing in 12/8. Beethoven was surely familiar with the convention in the baroque that would have allowed rhythms to be notated in this fashion, but it was no longer in fashion by the time of this sonata. Plus, we have for example Czerny's testimony that this was to be performed as written in a cross-rhythm, and he actually studied with Beethoven... though today I'll admit the standard interpretation tends to be more like 5/6+1/6. – Athanasius Oct 31 '19 at 23:19

This is a notorious question, and has been asked many times in the last 2 centuries - you are not alone! You're right in suggesting a polyrhythm - 4 against 3.

The difficulty is to play it musically. If you play it exactly, I (personally) find the two notes are a bit too close for comfort, so I tend to overdot the top line a bit. It's also important to distinguish the accompaniment triplets from the repeated G sharp theme. Not easy.

• One of my high school students played this at our fall recital last week. Not "easy" but far from impossible or "difficult" in the grand scheme of piano repertoire. The crucial element is to play the melody voice louder than the accompaniment voices. If done correctly they will not sound "too close." Dynamic contrast is hugely important, always. – NickGrooves Nov 7 '19 at 2:31

Every rendition I've ever heard, as I remember it in my head, sounds like it's based over a simple subdivision of that beat into six:

``````                1 2 3 4 5 6

upper taa---ta: * - - - - *

lower ta-ta-ta: * - * - * -
``````

This is what the notation says. The upper beam of notes ends with a sixteenth, which is half of the value of the corresponding eight in the triplet below; that is reflected by our 5 6 columns above.

This ain't exactly Brazilian Jazz; don't overthink it. :)

What I'm saying is that the dot you see on the eighth in this context shouldn't be taken literally as "time and a half", like it does when that pattern occurs in 4/4 time and has the time of a quaver. That doesn't even make sense, because the note values wouldn't add up to 3 eighths. The important thing is that the note is held over until some time close to before the timing of the ending 16th.