Conversation so far:
What kicked off MC Hammer's career?
Once signed to Capitol Records, MC Hammer re-issued his first record with additional tracks added and sold over 2 million copies.
Was MC Hammer's album Let's Get It Started well received?
Turn This Mutha Out, Let's Get It Started and They Put Me in the Mix were the most popular singles from this album.

Question: Who else did he collaborate with?
Self-contained rewrite: Who else did MC Hammer collaborate with?