Blaster is an Autobot who just loves music. He has a massive collection of rock-and-roll music that he's gathered from numerous worlds, and he prefers his rock heavy, so when you're charging into battle and hear that rallying music that Blaster is providing, you just might get that needed boost of morale... if your aural receptors don't start leaking.
Blaster was one of the many Autobots who left Cybertron aboard the Ark. When the Autobots reached Aquatron, he was part of the contingent who made planetfall under the command of Optimus Prime, and was among the crewmembers arrested by Quintessons. Found innocent of crimes against the Quintesson Imperium, Blaster was fed to Piranhacons in the city of Hydratron's Hall of Justice.