Several bands/artists go by the name of 13:
1. a sludge/doom metal band from New York, NY, United States.
2. a grunge band from Pilsen, Czech Republic.
3. an indie blues/rock & roll band from Amsterdam, The Netherlands.
4. a DJ and producer from Seattle, WA, United States.
5. a metal visual kei band from Kansai, Japan. See 「13」
6. hip-hop artist from Hollywood, Los Angeles.
7. a heavy/thrash metal band from Lithuania (1988-1989) .
8. a modern streetpunk / oicore band from Russia

Read more about 13 on Last.fm.