Mozart: Eine Kleine Nachtmusik, K.525, 1st movement
My iTunes library hasn't preserved the origin of this recording, so I don't know whose it is.
This is a pretty straightforward sonata form, One interesting aspect of the layout is that without the introductory fanfare, the piece lays out nicely into 16-measure phrases.
Another interesting detail is to follow the changes of tempo. The exposition is performed at MM 125 (= beats per minute); the development speeds up to 137, and the recap comes back to 125.
Here's the exposition. It starts in the key of G (the blue bass tones), modulating to D (yellow).
As is customary in sonata form, the exposition is repeated. If you compare the images side-by-side (such as by opening another browser window), you'll see they are, in fact, almost identical.
Note that the end of the first line here has the opening fanfare at the right-hand margin; everything before that duplicates the end of the previous image. I've shifted left by four measures to keep the main section lined up.
The development section is shorter; 32 measures instead of the 48 of the exposition. The tempo picks up noticably.
The recap. Again there's some overlap with the previous image, to get the fanfare at the end of the first line.
As is customary, the recap starts off the same as the exposition, but changes in the middle to flow toward the ending. Compared to the first image (you may want that 2nd browser window now), measures 1-16 are identical, but at about measure 19 something has changed. The third lines (mm 33-48) have textural similarities but are phrased differently, and of course the conclusion has to end in G, not D.
In fact, from measure 17 all the way through m 48 there's an strong V-I cadence, visible as the low yellow D jumping up to the blue G in the bass. At measure 44 it builds up a final head of steam; when the final G hits on the last line (again in blue), there's a full 10 seconds of resolution enjoyment.
© 2003-9 N. Resnikoff