Following last night’s release of iTunes 7.2 with support for DRM-free music downloads, the iTunes Store is now in the process of adding those tracks, dubbed “iTunes Plus” songs. A banner from the iTunes Store’s main page directs users to a list of albums available in the 256Kbps AAC format, including catalog releases by Paul McCartney, Coldplay, Frank Sinatra, the Rolling Stones, Gorillaz and Norah Jones. The list appears…