Two and A Half Bronies Gaming channel.

The Two Bronies: Vinyl Snapz (Liam) Gregory (Tom)
The Half Brony: Double Thrill (Josh)

The song is called DJ Pon-3 - Copyrights
http://www.youtube.com/channel/UCj5ceb5aLKALh-g6vhAcpxw
Song here: http://www.youtube.com/watch?v=MYb4dazIOJY