In an email to NBC News, composer Will Van De Crommert wrote that he was "exploring legal options" and that "this particular track, which was originally entitled Mirrors, is available to license online. I however was not notified of any licenses for political rallies, nor did I authorize such use." A YouTube representative said in an email Monday that the company "removed the video in question for violating our harassment policy, which prohibits content targeting someone by suggesting they're complicit in a conspiracy theory used to justify real-world violence, such as QAnon." A Spotify representative said that "the content in question was removed following an infringement claim...."
Van De Crommert said the uploads in question are identical to his and that he has no association with the account that put his music online alongside QAnon language. "I do not align with the views of QAnon, and this individual has unlawfully distributed my music under their own name," he said.
The Will Van De Crommert Track: https://soundcloud.com/will-van-de-crommert/mirrors
And here's Newsweek talking about it: https://archive.ph/UHNxQ