Typically, songwriters receive a one-time licensing fee for the use of their song title on a T-shirt. This fee can range from a few hundred dollars to several thousand dollars, depending on the factors mentioned above. In some cases, songwriters may also receive royalties based on the sales of T-shirts featuring their song title.
It's important to note that licensing agreements for song titles can vary widely, and the specific terms and conditions can have a significant impact on the amount of compensation that a songwriter receives. Songwriters should carefully review any licensing agreements before signing to ensure that they are receiving fair compensation for the use of their work.