Interesting iTunes catalog

I'm not so much interested by the music as I am by the way that the catalog has been done, but Pearl Jam is now offering a huge number of "albums" (75), many that are actually concert recordings, by date, of their 2000 tour. Each individual song is available for $0.99, but you can choose to hear exactly what you heard at the original concert.

Interesting idea, I wonder if any other artists are doing this.