I've heard Metallica's name mentioned on TV promos. If I were planning to watch any of the concert (I'll catch the Cubs-Pirates on WGN instead), my money would be on Nunatak: Nunatak will play at least part of its set outside in fingerless gloves, with temperatures plummeting to 14 degrees Fahrenheit.
I just knew there'd be a more edifying reason to watch the Cubs tonight than Live Earth.