Percy - trumpet (duh)
Annabeth - center snare
Jason - drum set (in pit)
Piper - marimba
Leo - quads
Frank - mellophone
Hazel - alto sax
Clarisse - tuba
Stolls - trombone
Grover - flute
Reyna - drum major
Thalia - Bass 5
Juniper - color guard
Octavian - the worst clarinet player
Chris - tenor sax