I'd love to volunteer for this. I play expert on all instruments quite proficiently. I have extensive experience in playing custom songs (on GH2) and a bit of experience writing them which, although not directly relevant, means I know enough about charts and gameplay in general to be able to provide useful constructive feedback.
From the launch of RB1 up until the Who pack, I purchased every song available for download. Unfortunately, I have since then been unable to continue collecting every song due to financial reasons. As you can well imagine, I would be thrilled to once again be able to have a steady flow of new content for one of my favorite and most-played games.
I will be attending classes during the winter/spring semester; however, I will still have four days per week completely free. Considering I spend most of my free time either playing Rock Band or discussing it on forums, I would certainly be able to review new songs with a frequency that meets your expectations.
Thanks for this opportunity, thanks for considering me, thanks for making the best music/rhythm games of this generation and the last, and thanks for making such a tremendous effort toward revolutionizing the genre once again with the Rock Band Network.