If I am the first person to mention this band, then wow I am amazed. In my opinion Alice in Chains released several great songs that would be great to play on Rock Band.
My Alice in Chains Pack:
Man in a Box
Down in a Hole
Heaven Beside You
and even one of those songs could even be replaced by Would? or Dirt because they are great songs too. This band produced some great songs and I feel they should be greatly considered for DLC for Rock Band.