In the “Sadie Hawkins” episode of Glee, the kids did a version of Sir Mix-a-Lot’s iconic “Baby Got Back.” Except it wasn’t just any version of “Baby Got Back.” It wasn’t even their version. It was, seemingly, a cover of a cover; Glee covering Jonathan Coulton covering Sir Mixalot.

Coulton’s arrangement is decidedly different from Sir Mixalot‘s, a unique arrangement that’s all his own. So when Glee covered the song on the recent episode, it was obvious to Coulton himself – and any Coulton fan – where the arrangement came from. The versions were so similar, the Glee version included Coulton’s line “Johnny C’s in trouble.” In the original, it says ”Mix-A-Lot’s in trouble.” FOX later dropped that line from the Glee performance.

The show's producers, who haven't spoken publicly about this flap, reportedly told Coulton that using his version is well within their legal rights. They told me "I should be happy for the exposure," writes Coulton, "even though they do not credit me, and have not even publicly acknowledged that it's my version."