For 10 points, identify this Russian composer of Rhapsody on a Theme of Paganini.
The three left hand fortissimo chords A, G#, and C# open this composer's "Prelude in C sharp minor". One of his orchestral works based on gypsy themes ends in a loud E major chord, and alongside Caprice Bohemien, he wrote a suite with movements marked "Non allegro" and "Andante con moto" which uses a three-note motif and features alto saxophone near the beginning. Another work by this composer of the Symphonic Dances begins with four quick notes in A minor followed by E and F notes and contains 24 variations on the title melody. For 10 points, identify this Russian composer of Rhapsody on a Theme of Paganini.
The three left hand fortissimo chords A, G#, and C# open this composer's "Prelude in C sharp minor".
Sergei {Rachmaninoff}