Trade group U.K. Music is pushing officials to lobby against the U.S. proposal, which would more than double rates for foreign artists playing U.S. shows.
The agency, which represents The 1975, The Cure and others, wanted out of the merger after selling to ICM Partners in 2020.
Despite the upturn, Saturday's show still drew the Brits' third-smallest TV audience.
The U.K.’s biggest music awards show is facing a backlash over no female artists being nominated in the gender-neutral best artist category.
The Parliament's DCMS committee says the UK needs to develop a "wide-ranging national strategy for music."
Montello, who takes over in January for Paul Pacifico, had been CEO of the Association for Electronic Music.
In a final report, watchdog says UK policymakers must determine if revenue splits from services like YouTube and Spotify are "appropriate and fair."
But the study, which does not include China and India, finds that 30% of those surveyed still turn to pirated sources for music consumption.
A suicide bomber killed 22 people and injured more than 800 at the show at Manchester Arena in the terror attack.
The Middle East and North Africa grew the fastest of any region in 2021, with recorded music revenues growing by 35% to $89.5 million
