Voicechat vs music and sound

Over at Cuppy's latest blog, Tachevert makes an excellent point:

"I take music pretty seriously, and I’ve historically ALWAYS left music and sound on in games. Lately, though, I do find myself backing off on MMO music — especially if I’m raiding or otherwise trying to use voice chat. Without sound effects, though, I always feel as though I’m missing too many cues to the action."

Brent pointed out weeks ago that SOE will soon be integrating voicechat software into all of their games, and I expect other companies might be doing this as well.

Are voicechat and music inherently at odds? How about voicechat and sound effects?