Universal Music Group (UMG) has removed its extensive music catalog from the popular short-form video app TikTok after the two sides failed to reach a licensing agreement, UMG announced today.

The announcement ends months of negotiations and escalating tensions between the world’s largest record label and one of the fastest-growing social media platforms. UMG, which represents artists including Taylor Swift, Billie Eilish, and The Weeknd, accused TikTok of “bullying” tactics and attempting to secure licensing rights “worth less than the previous deal.”

In an open letter, UMG said TikTok had refused to properly value the music that was helping fuel its rapid expansion.

TikTok hit back in a blog post, arguing that it provided “powerful support” for artists through promotion and that UMG had made unreasonable demands during negotiations. The company said it was disappointed that UMG had mischaracterized the talks.

The removal of UMG’s catalog deals a significant blow to TikTok and its community of viral video creators. No longer having access to chart-topping songs could hamper efforts to produce engaging short videos. For UMG and its musical artists, however, TikTok had accounted for only a small fraction of total revenues.

Still, the high-profile dispute underscores the growing power and influence of social media platforms over the music industry. As TikTok’s user base balloons, music has become central to its identity and success. With over 1 billion monthly active users, TikTok has become too big for record labels to ignore when negotiating licensing deals worth billions of dollars.

It remains unclear whether the two technology and entertainment giants will return to the negotiating table or if the music of Swift, Eilish and others will remain indefinitely absent from TikTok. For now, TikTok creators will have to make do without hits from music’s biggest label.