Best surround speakers for music?

You dont need all surround speakers to go down to 30hz or below as your bass mgmt will take care of that and information that low and in surrounds will be non directional. Its just not practical for many to match all speakers or get speakers that size be it budget, space, waf or whatever. You should no doubt look in same line of speakers to find a surround solution or at minimum pay close attention to drivers and select speakers as similar as possible. You wouldnt want to mate a ribbon tweeter with a metal dome for example.

The Gallo Reference AV speakers are *very* good. And, using the wall as a backplane they are pretty flat down to about 45Hz. Your surrounds do NOT need to have low bass output, a good subwoofer will handle this quite well.

Small Totems are killers.

I run a pair of usher rw 729's and have been very happy with their performance;I would also think Schubert's suggestion has merit as well.

This may seem odd, but I use ERA D4's for surround. They come with a mounting bracket, take up very little space and can handle a lot of power. Probably not the most revealing speaker out there, but for surround I think they are great. FYI, Linn Katan/Trikan across the front.