Another attempt to make file-sharing profitable

Qtrax is launching in October, and claims to have 20 to 30 million copyrighted songs representing all four major labels ready to share, in return for the watching of some advertising.

We're a little puzzled by the "20 to 30 million", though - to not know within a margin of error of ten million tracks what your offer is seems a little, um, overly-relaxed, doesn't it?