16 + 88 is a three-movement piece for flute and piano. The name of the piece comes from the number of keys on a flute and a piano, respectively. The first movement is similar to a fantasia, the second movement is modal, and the third movement is a more upbeat sonata.
The first movement, in ABA' form, begins with quick trills and runs. The minor key, syncopated bass line, and sweeping flute lines create a dance-like effect. During the B section, the key changes to a major feeling, and the music slows down. While the piano has a similar line here, the feeling completely changes. With the return of the A section, the flute has a short cadenza and races to the end (with the eventual addition of the piano).
The second movement begins with flute in the low range and scarce piano chords. Since the piece is in D Dorian mode, it has a slightly spooky, yet natural feeling about it. As the piece progresses, it becomes more busy while still keeping the general reflectiveness. Overall, the main melody stays throughout almost the entire piece (with the exception of a short transitional melody near the end). The powerful climax, while short, feels like an answer to the previous questions in the piece. Immediately after, however, the movement ends on a question.
In the final movement, the energy is back with an almost constant 16th 16th 8th motion in the flute. Meanwhile, the piano has a melody of its own, but it occasionally takes from the flute. Since the movement is in sonata form, there are two main melodies in the first section. While the first has more energy and is in a minor key, the second is a little more joyful and fun due to its major key and simpler rhythms. The piece develops the two melodies and passes them around, and it ends on a happy major chord.