Where'd you see that?
I'm gonna go out on a limb and say it's referring to a few flashes where the composer for the original music got into a dispute with Hussie and his songs had to be removed from Homestuck and the albums. Then it was replaced with other music. Off the top of my head, the "big" ones were [S] Midnight Crew, [S] Retrieve Package, Round 3 of Dave vs. Bro, and both of Jade's bass solos.
I'm pretty sure you can find a link to those tracks under the sound page on the wiki. Some of it was pretty cool. Some of it...was not (Dave vs. Bro R3).
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