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Checking out cadences for a student, I thought that 'perfect' was the U.K. version of the U.S. 'authentic'. Then went on to find 'perfect authentic' cadence. It seemed like tautology, but it appears to be to do with the voicing. Does this become an issue? 'Perfect' is V>I, or V>i: end of? How does the voicing change anything? What other different cadences are there that are more specific than the usual perfect/imperfect/interrupted/plagal?

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Not only are there inconsistencies between UK and American terminology, there are inconsistencies within just the American terminology! You're 100% correct that an "authentic cadence" is V--I, but it can be a bit more complex than that; here I'll give you the "academic" way of understanding classical cadences.

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  • At A, we see the common Perfect Authentic Cadence (PAC). It's labeled such because both the V chord and the I chord are in root position and the soprano ends on scale-degree 1.
  • At B, we see the Imperfect Authentic Cadence (IAC). It's labeled this way because, although both the V chord and the I chord are in root position, the soprano ends not on scale-degree 1, but on scale-degree 3. (It could have also ended on scale-degree 5 and still been an IAC.)

From these two definitions, we see than an Authentic Cadence (AC) involves a V chord moving to I and both are in root position. This latter part can be contentious, but a number of music theorists, from Heinrich Schenker to William Caplin, have insisted on the V chord also being in root position. (More on that later.) The distinction between Perfect and Imperfect solely rely on the soprano scale degree.

  • At C, we see the standard Plagal Cadence. Note that some theorists don't consider this a "real" cadence per se because there's no V chord. I think that's silly, but from a standpoint of Schenkerian analysis, I understand why they say that. (In short, the Schenkerian mindset is that music is, at its most basic, a motion from tonic to dominant and back to tonic. If there's no dominant, there's no complete musical motion, thus no cadence.)
  • At D, we have what we in America call the Deceptive Cadence (DC). It typically moves V--vi, but really it can move from V to anything that's not I. (Note that some distinguish a Perfect Deceptive Cadence from an Imperfect Deceptive Cadence based on what scale degree is in the soprano, but this is pretty rare.)

Now, here's where the inconsistencies between textbooks come in:

  • At E, note that the cadence ends with IV6--V6--I. Some textbooks (like the Kostka/Payne) will call this an IAC because the V is inverted. Though this is one way of viewing it, the majority of professional music theorists will call this a Contrapuntal Cadence (CC) on account of the stepwise motion in the bass. In short, if one or both of the final two chords is/are in inversion, it is a Contrapuntal Cadence.
  • At F, we have a similar issue, but here both the final chords are in inversion: the V quickly moves through a V42 into a I6. You can call this a Contrapuntal Cadence, but it's such a common progression that it has earned its own name: an Evaded Cadence (due to how the bass quickly "evades" the feeling of closure with a root-position tonic chord).

Edit: Since I'm here I figured I might as well include some discussion of half cadences as well, even if they weren't addressed in the original question.

  • At G, we see the standard Half Cadence (HC). For a half cadence, all that matters is that it ends on a root-position V chord. (But again, some think a HC is possible with an inverted V chord.) There's also a disagreement on whether or not this V chord can include a chordal seventh. I think a V7 is fine to create a HC, but some disagree!

  • And at H, we see a more specific type of HC. Due to the half-step motion in the bass from the iv6 to the V, this is called a Phrygian Half Cadence. This must be a half step in the bass; if we move from IV6 to V in major, with a whole step in the bass, this just goes back to being a regular HC.

  • That's a lot of info! Thank you for your effort. I can surmise that PAC cannot happen unless there is satb - 4 part harmony. Although 4 part shouldn't necessarily be necessary to create a cadence. And IAC does sound like an oxymoron! Don't suppose 'imperfect perfect' cadence is in the running! Until now, I'd have called E and F perfect cadences, which I suppose they are, but special cases thereof. – Tim Jan 18 '17 at 10:06
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It does have to do with the voicing. I found a definition that explains it pretty clearly I think,

In a perfect authentic cadence, the dominant chord in root position is followed by that of the tonic in root position, and according to some theorists, the cadence is not "perfect" unless the uppermost voice is the tonic in the final chord.

http://dictionary.onmusic.org/terms/2563-perfect_authentic_cadence

An authentic cadence then I guess could be summed up as any old V - I.

I only remember from school this naming applying to this type of cadence, I do not remember anything like a perfect plagal cadence, or perfect authentic deceptive cadence.

  • That's the confusing bit, I think! If one has to end on root position, why only that one? – Tim Jan 17 '17 at 13:24
  • I think it helps to remember that these terms are always created in reaction to things happening in music. A perfect authentic cadence is really just someone saying that this is the most perfect version of this cadence, I suppose the other cadences could have that distinction based on voicing but just don't, as far as I remember. – Rockwell Rice Jan 17 '17 at 13:30
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    Bean-counters like counting beans. The more types of beans there are to count, the better! – user19146 Jan 17 '17 at 13:54
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Great Question!

In a perfect authentic cadence (PAC) (V-I or V7-I), both chords are in root position: that is, the roots of both chords are in the bass, and the tonic is in the highest voice of the final chord. This is generally considered the strongest type of cadence and often found at structurally defining moments.

An imperfect authentic cadence (IAC) is similar to the perfect authentic cadence, but not as "perfect". There are four types of IACs:

  1. Root position IAC: (V-I or V7-I) Similar to a perfect authentic cadence, but the highest voice of the last chord (I) is not the tonic.

  2. Inverted IAC: (Ex. Vinv.-I) One or both chords is inverted.

  3. Leading tone IAC: (viio-I) The V chord is replaced by the viio chord, but the cadence still ends on I.

  4. Evaded Cadence: (V4/2-I6) It goes from V4/2 to I6. Because the seventh must fall step wise, it forces the cadence to resolve to the less stable first inversion chord.

A plagal cadence (PC) is a cadence from IV to I. It can also occur as ii6-I, ii6/5-I, or vi-I.

A deceptive cadence (DC) (also called an interrupted cadence) is a cadence from V to vi. The most important irregular resolution, most commonly V7–vi. This is considered a weak cadence because of the "hanging" (suspended) feeling it invokes. It can also occur as V-IV as well. This cadence calls for continuation.

A half cadence (HC) (also called an imperfect cadence) is any cadence ending on V, whether preceded by V/V, ii, vi, IV, or I—or any other chord. Because it sounds incomplete or suspended, the half cadence is considered another weak cadence that calls for continuation.

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