There are multiple artists with this name:
1) A post-thrash/metalcore band from Norway.
2) A band from Santa Cruz, CA. Members of Comets On Fire and Whysp.
3) A hip-hop group from Pennsylvania consisting of members C-Doc and Tirade. 1)
Lowdown is a post-thrash/metalcore band from Norway. The band was founded during the winter of 2000, and played live for the first time in 2001. They secured a record deal with Black Balloon Records after their second live show, and released their debut album (named "Unknown") in 2003.

Read more about Lowdown on Last.fm.