Should a music supplement (string) be accompanied?

Does anybody know/ have a strong opinion about whether string applicants should send the Princeton supplement with a piano accompaniment?

Yeah, at least according to my teacher it’s fine (submitting a flute supplement which has a piano accompaniment part). If it’s like a concerto or something like that, the piece would send kind of empty without some sort of supplement, at least in my opinion.

^ thank you. That makes intuitive sense. I guess the trick is to make sure your own instrument comes through.