The 2nd movement of the Mozart k310 Piano Sonata resembles standard sonata form in many ways. It opens with a first theme in F (same as key signature). The theme is four bars long; two bars of antecedant, two bars of consequent. Mozart then starts the first theme again with a 32nd note run pick-up instead of the 16th note arpeggio pick-up in the the begginning of the piece so we are prepared for variation in the second statement of the first theme. He then continues the theme with variation until the consequent phrase which is completely different from the first consequent phrase. This new consequent has not only faster rythmic movement but also compressed harmonic rythym. This tension prepares the listener for the textural shift that is about to occur. The Bridge begins with 16th note arpeggios in the bass, a contrast to the quarter note dominated bass of the first theme. Unlike a typical bridge section which modulates far from the original key, this bridge just moves from I to V7 for several bars before going to ii. Then, rather than using the ii in a familiar ii-V7-I cadence, the ii is arpeggiated for an entire bar in the melody. This is further obscured by the chromatics used in the arpeggio, a half step movement to each chord tone. The next bar returns to I without a real cadence and then quickly moves to V. We are now at the second them and it does begin in C (V, the way most second themes begin), but C has not really been tonicized. C still sounds like V. This is solved by the ‘b’ natural in the pickups to the second theme, implying the new key center with a leading tone in place of a true tonicization from a cadence. The second theme, like the first, has an antecedant and consequent phrase. However, they are each only one bar rather than two as in the first theme. They are then repeated without variation but in another register with a trill in the treble. There is then a sonata form rounding off o...
