Look, I like Marty and his music as much as the next guy, but it's just one employee. There's really no reason to get this frustrated over it. Despite being "terminated without cause" according to Marty, there's almost definitely a good reason for it. The OST for Destiny is already completed anyway, so his music is still going to be in the game. Canceling your preorders, attempting to create petitions, and staging childish e-boycotts over it is just plain silly.
There's nothing left to do now but wish him luck in all his future endeavors.
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Don't worry I'm sure they will get over it.