Musical Composition Craft and Art # 53 - On Convincing Continuity

追加: 2026-05-01

[00:00:21]Elliott Carter coined the phrase convincing continuity as a requirement for a successful musical composition.

[00:00:28]I find it useful, since this doesn't refer to any particular style.

[00:00:32]Let's examine what it means exactly.

[00:00:35]Here's an example.

[00:00:41]>> [music] [music] >> This beginning consists of two very different musical ideas.

[00:00:59]Does it sound incoherent?

[00:01:01]Well, I could imagine a situation in the film where the story might justify such a big contrast, but as a piece of absolute music by itself, it would depend a lot on what follows.

[00:01:11]For example, if there follows a third idea, also very different from these two, it begins to sound just like a list, sort of a catalog, rather than one piece.

[00:01:26]>> [music] [music] >> But let's go back to the beginning.

[00:01:48]We make those first two phrases by themselves sound more coherent.

[00:01:52]Here are some ways to do that.

[00:01:54]First, we could make the second idea into a kind of surprise by preparing the listener to know that something different is about to arrive.

[00:02:01]>> [snorts] [music] [music] [music] >> The horn crescendo in the last part of the first phrase, combined with the crescendo in the winds, creates expectation.

[00:02:27]Then the timpani attack on the first beat of the second idea feels like an arrival after that preparation.

[00:02:33]Another way to make the whole more coherent would be a transition.

[00:02:37]The two ideas here are different in many dimensions, in particular, harmony or tonality, meter, motives, register, articulation, dynamics, and timbre.

[00:02:50]The key to a successful transition is not to change too many things at once.

[00:02:54]Here are two possible transitions, many others are also possible.

[00:03:06]>> [music] [music] >> In this first transition, I've added a phrase that introduces a lyrical legato line in the oboe.

[00:03:30]This line starts with the same motive the second idea will arrive with.

[00:03:34]Meanwhile, clarinet one has a repeated note accompaniment recalling the opening idea, and clarinet two fills out the texture contributing to the overall crescendo.

[00:03:43]The new phrase gradually descends in register with bassoon two entering very close to the tuba trombone phrase in the second idea.

[00:03:51]It also alternates the repeated notes with more legato lines, thus preparing the way for what comes next. So, when the second idea arrives here, it's much better prepared than the original version.

[00:04:01]Here's another transition which changes different things at different times.

[00:04:14]>> [music] [music] [music] [music] >> This starts in a low register with the bassoon recalling the piccolo's idea.

[00:04:37]The staccato chords in the flutes are now in the cello pizzicato.

[00:04:41]Then in the fourth part of the answering phrase, the bassoons begin to anticipate the coming idea in the brass.

[00:04:47]Then when the horns arrive at the crescendo on F, they prepare the new louder dynamic.

[00:04:52]Note that had those pizzicato chords been legato, it would have been a little bit too contrasting, creating a kind of bump in the continuity. Listen.

[00:05:12]>> [music] [music] [music] >> This is exactly the kind of detailed work that's often necessary to create convincing continuity.

[00:05:32]Convincing continuity is primarily a requirement for immediately consecutive phrases. Something needs to provide the listener with an immediate sense that what they are hearing isn't just random.

[00:05:42]Usually, this is accomplished with one or more salient help common elements between the two phrases.

[00:05:48]In the case of a transition, this is exactly the point. Not to change too many things at the same time so listener loses their place.

[00:05:55]Over the long term, convincing continuity, of course, includes more salient contrasts.

[00:06:00]Let's look at a short example from the standard repertoire to see how this works. The start of Beethoven's piano sonata number five.

[00:06:07]>> [music] [music] >> The beginning consists of a strong C minor chord followed by a dotted note arpeggio motive.

[00:06:50]This is followed by a contrasting sigh motive, quieter with a calmer rhythm in the same key measure three and four.

[00:06:57]Then in measure nine, Beethoven adds a little arpeggio pickup to the sigh motive.

[00:07:01]That's repeated with the accompaniment in a higher register, and then again in octaves in a longer phrase.

[00:07:07]This phrase clearly ends on an open harmony, which isn't conclusive.

[00:07:11]There follows a new motive in triplets which repeats two more times on more cadential harmony.

[00:07:17]Why does the new motive work here? Well, let's look at what doesn't change. The left hand refers to the sigh motive of the preceding bars. It also has the same bass as the preceding chord. The tonality is the same, the instrument and the tempo don't change either, and neither the articulation or the register at the start of the phrase.

[00:07:35]The sequence of the triplet motive goes down and that overlaps with the return of the first idea, now without the second sighing phrase. After a very firm perfect cadence in C minor, another idea arrives.

[00:07:47]This is somewhat more contrasting with its legato character and the new A flat major key.

[00:07:52]But the opening accented E flat is not a strange note after the C minor cadence.

[00:07:56]The tempo, register, and timbre are not new, and even the opening rising sixth of the melody echoes the opening motive at its rising sixth in bar one.

[00:08:05]The thing to notice here is the various degrees of contrast. For example, measure three to four is a bit contrasting, but still in the same key, timbre, and tempo. At the start of the second system, the phrase has a new beginning, but finishes with something familiar.

[00:08:19]Then the triplets arrive, but as I've already pointed out, there are multiple common elements with what precedes.

[00:08:24]And even the new idea after the strong cadence doesn't change very many elements at once.

[00:08:29]Take any one of these little bits of contrast and imagine them in a different key or register or tempo or timbre, and you'll notice how the contrast is much stronger, too much, in fact.

[00:08:40]Things like the instrument, the tempo, and the harmonic style are established very quickly at the opening, and the subsequent contrasts all remain within that world.

[00:08:48]Convincing continuity always implies having some common elements with what comes before.

[00:08:53]It's important to look at all the musical parameters, not just harmony and motives, when evaluating musical continuity.

[00:08:59]Sometimes a change of tempo or register along with a new motive can create a stronger contrast, but combine it with some other big change and it becomes too much.

[00:09:07]This way of thinking about continuity is a huge part of the craft of composition, and the first thing to look at is the common elements that immediately precede the new passage in question.