Hi, This is not actually a sonata, it is just named that. This originally was meant to be an awesome piano solo in E-flat minor, but I added the trombone, piccolo and harp to make it more interesting. It starts out with each instrument sorta having it's own independent melody, then it gets to a part where it rests and each instrument gets a solo part by itself. After that the harp starts it's arpeggios, and then the piano piccolo and trombone come in to play the arpeggios too and then after that it ends, and repeats again. I really like this piece, and I hope you enjoy too! -QuantaMelon, Master of the Mystic Music