You mean that anybody who swings by can add their little bit? I'm already involved in two other projects, but I'd partake.
.... Hmmm...... somebody selects a national anthem that they're not familiar with (so unbiased) and writes an arrangement for piano trio (piano, violin, 'cello), and ends it. The next person writes a transition, and does their own anthem of choice... (or writes a variation on the last one) and we end up with a suite of re-realised national anthems. I'd be interested to see how this would turn out. I'm not to fond of the piano trio part of it... I've never had luck writing or arranging for it before, but that's MY problem....
I'd like to see more than just the two current projects going on at one time here in Collaborative... so if there's interest.... I say go for it.