From gtasanan.com
- Take-2 Interactive
As for the music itself - we know very little at the moment. Death Row Records announced that 3 of their songs will appear in San Andreas, although, the announcement was later removed (without a doubt, requested by Rockstar Games).
- Death Row Records Website
Regarding Lazlow, the faq section of the site says he is, and I see no reason not to believe them, but who knows? I hope so though.