The song is a redo from John William's piece "Zam The Assassin And The Chase Through Coruscant". If you listen through the whole song, you can hear it in specific parts. For example, you will first hear it at 2:30, and another at 4:20. The only other ways to directly access the drum part is to extract it from Star Wars Battlefront's sound files and SWTOR's sound files, both of which are illegal.