iTunes has 2 million+ songs, napster, MSN music, Rhapsody, eMusic has 1 million + each.
To date, Last.fm has “scrobbled” 65 million tracks by 8 million artists, in just about every country in the world.
Just to add another measure. Gracenote (aka CDDB) has info about more than 3.8 million CDs, over 48 million tracks. Looong way to go.
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