Taylor Swift and The Weeknd are represented by Universal.
Major record labels earn royalties from streaming and social media platforms.
The giant Universal, however, said that TikTok was offering to pay a rate that is only a fraction of the rate paid by major platforms in a similar situation.
Calling Universal's statements false, TikTok believes the label has chosen to turn away from the powerful support of a platform that has more than a billion users and serves as a free promotion and discovery vehicle for their talents.
Although TikTok has a large number of users, it only accounts for about 1% of total revenue of Universal, further denounced UMG in its letter.
Universal notes other issues such as the presence of a large number of AI-generated recordings on the TikTok platform.
Taylor Swift and The Weeknd are among the artists labeled by Universal.
Owned by the Chinese company ByteDance, TikTok is one of the most popular social networks in the world, with more than a billion of users.