Daniel 'Kareshi' Brown is a speedrunner at Speed Demos Archive. He speedruns classic games that are usually known for their difficulty.
Speedruns on SDA:
Kareshi is also an excellent pianist and plays renditions of classical video game music. At Magfest 6 Kareshi and Emptyeye performed "Pianotoads", which consisted of Emptyeye speedrunning Battletoads, while Kareshi did the instrumental.