I don't see any reasons not to include it.

However, I suppose (most of) these staff members work with other things than music reviews. In the last site update I started to give such sources a somewhat lower weight. In the spreadsheet I think it could have the normal weight though.

a music-only site? (or at least that's the core of its site) On the homepage, it says "music, downloads, music videos, lyrics and photos."

MySpace is a social networking site, with music, movie promotions, and that kind of stuff.