Although "Take Me Out..." is one of my favorite DS9 scores, I've always been disappointed that the Federation Anthem didn't turn out to be Jerry Goldsmith's TMP theme.
I found the anthem to be a bit meandering and forgettable really. But it's certainly something I can see being included. Also countless musical performances at Quarks bar over the run of the series, klingon opera? (I hope not!), Dax's tune from Equilibrium, the do-ra-me bit from Chrysalis. There's quite a list. I hope this stuff doesn't take away from more memorable cues such as happened on the TNG disc with source music from Inner Light and The Survivors.