To add to
Gavinmad
's good recap.
The way most game sound-tracks work is that they are short, reactive clips that go with the flow of the action. So Mick Gordon, the composer, had produced over 4 hours of music (even though he was only contracted and paid for 2 hours) that they stitched into the game, to make a perfectly fine and reactive sound-track. There were plenty of challenges to even get to that point, but everyone got their work done and it would be all good if that is where the story ended.
Then, about 6 months before the game launched, ID/Bethesda announced at E3 that the collectors edition would also get a full OST soundtrack. Well, as you can see, producing the game music and an OST are two totally different things. It was a surprise to Mick because he hadn't be asked or consulted at all about producing an OST, but it was not too concerning, because they had all that time to get it done.
During that 6 months, Mick was constantly asking Marty Stratton (the game producer) for a contract to get to work on the OST and Marty completely ignored him. Come to find out later, that Marty asked an internal ID Studio guy on the sound design team to take Mick's 4 hours of piecemeal tracks and make an OST out of them.
Two days before the game launches, Mick finally and surprisingly gets a contract from ID/Bethesda/Zenimax to have him deliver the OST. He would have about a month to do it. Mick is totally upset and distraught about it, but tries to deliver it anyways within the timeframe they need it. He gets 10 of the 12 tracks fully produced and runs into a tech issue at the last minute that is going to delay his delivery of the full package by about 5 hours. Marty takes this opportunity to throw out all his work and instead go with the internal studio guy's piecemeal 4 hour soundtrack, call it Mick's shitty work and blame him for everything. This OST was cut and paste work without transitions, beeps, blips, and pings that would destroy your eardrums. To call it amateurish would be kind. And they called it Mick's work.
Marty goes to Reddit and destroys Mick's reputation. Internet trolls start doxing Mick, spamming his email to the point his server crashed, harassing Mick's other clients trying to get him fired, death threats, and 24/7 phone calls with messages threatening him and his family.
Marty and ID/Bethesda/Zenimax lawyer up, and try to pressure Mick to signing a six figure settlement and gag order. Mick declines and instead tells his side of the story.
It is all pretty fucked up.