Meltdown could refer to one of several bands:
1) Meltdown is a Hardcore/Thrash Metal band with members based in both Rhode Island and Massachusetts. They have released two eps and a 7" with the most recent being "Demolition", released in the summer of 2007 on Malfunction records. The band often play shows with Shipwreck and other MVHC related bands.
2) Short-lived project of former/present members of Crainium, Crom-Tech, All Scars, Emergency, and Metamatics, circa 1996.