Donald Trump‘s habit of using famous artists’ music at his rallies is about to backfire on him — that’s what the Foo Fighters are saying after he cranked one of their biggest hits … without permission.

Trump brought out Robert F. Kennedy Jr. — who ended his campaign and endorsed Trump — Friday evening in Glendale, AZ while blaring FF’s 1997 hit “My Hero,” and while the pyrotechnics and music fired up the crowd … it simply pissed off Dave Grohl and company.

Once the Foo caught wind of the wild scene in AZ, the band sent Trump a clear message: Don’t do that!

Grohl’s band promised one more move that’s sure to piss off Trump — it said any royalties generated by Trump’s usage of “My Hero” would be funneled to Kamala Harris‘ presidential campaign.

So, basically, if there’s a bump in streaming or purchases of the song in the wake of Trump’s AZ rally … Foo Fighters will donate those funds to team Harris-Walz.

It’s a new ploy for an old problem — previously, Trump has played the late Isaac Hayes‘ “Hold on, I’m Coming” without permission … prompting Isaac’s estate to file a notice of copyright infringement.

Trump also found himself in hot water with Beyoncé after his campaign posted a video on X showing Donald walking off a plane scored with “Freedom.” It was a full troll job, as the song is VP Harris’ campaign anthem … something Bey fully authorized.