There are FIVE bands/artists that use the name Megalodon.
1) Megalodon is a progressive/math/djent metal 5-piece from Cape Town, South Africa.
Megalodon (named after a song from Mastodon's "Leviathan") was spawned by the creative minds of Ruan Jordaan and Nuri Grobbelaar. After discussing the project for a few years it has finally been given life. Together with Thomas Theron and Alex Toua the band has become an entity of its own in a very short period of time. Finally with the addition of Louis Henn on guitar in November 2010 the line up was completed. Megalodon brings you a (planet) crushing 8 string metal sonance.
2) Megalodon is a dubstep artist and lives in Los Angeles & San Francisco, Ca, USA
3) Megalodon is a braindance/idm producer named Jack Cooper. His free EP is available from Love Love Records here - http://www.loveloverecords.net/lovmp309
4) Megalodon is a jazz/fusion band originally from State College, PA. Visit www.megalodonmusic.com for more information about their album, Edible.
5) Megalodon is a Hardcore/Metal/Progressive band from Eu Claire, WI:
We are five dudes from Eau Claire that play some fast, heavy, angry shit. We got together midsummer of '07 to do what we love, and thats what we're still doing. We procure a fresh breed of music, drawing influence from anything along the lines of hardcore, death metal, punk, and prog. This is something new, something big, and we cant wait to share it with you!