I've stayed out of the discussion (more like a riot) about canned music in Michigan Stadium and "I can't hear the band". Now that there seems to be a solution I'm happy to pass it to you.
M-Go Blog received an e-mail from the Director of Bands which said that rule has changed and they can amplify the band so everyone in the stadium can hear it equally.
Read it here: Band Amplification: The Word From On High