This is a string cover of the song Cohen's Scherzo No. 7 "Andante con Fuoco" from Bioshock 1. It's originally played as a piano solo, and later on accordion in the DLC for Bioshock Infinite, "Burial At Sea". I tried to use percussion to highlight the waltz-like nature of certain parts of the song, and to stay faithful to the original "feel" of the piece.