SPIRIT DAY ACTS:

So for the Strings, I envision a pentatonix-style acapella song.
Cello is, surprisingly, pretty good at beatboxing and creating those percussion-like sound affects, so she does that. Contrabass obviously, as the only male, is the bass line. Viola sings alto, and Violin I and II alternate harmonies in the soprano range. Of course though, everyone (except Cello) gets the melody at some point, even sweet Bass with his soprano accompaniment chords.
Right now they're singing "Eyes of the Camera", but if I find a better fit I'll change it.