Mainstream Money was created in 2006.
Mainstream - band - was created in 1994.
Mainstream EP was created in 1998.
Mainstream Publishing was created in 1978.
Mainstream Science on Intelligence was created in 1994.
Embracing Mainstream Success was created in 2009.
Mainstream Outlawz was created on 2009-01-27.
Godspeed into the Mainstream was created on 2005-09-12.
Down by the Old Mainstream was created in 1995.
Exile on Mainstream was created on 2007-10-02.
Mainstream Renewable Power was created in 2008.
Mainstream - Quiet Sun album - was created in 1975.
Well, in MY OPINION, underground is better. First of all, most mainstream sounds the same, same rhythms. Underground has a more creative tune. Usually, underground has more meaning. In mainstream it's usually, about partying, drugs, and fake love. Plus, underground singers don't always do it for money. Mainstream singers usually do it for money.