Elton John was filled with 'Glee' to do this duet.
Speaking at his Wednesday gay marriage fundraising gala, John touched on the recent work he did with 'Glee' star Matthew Morrison on his upcoming solo album.
"I just did it! It's a duet. It's great, really fantastic. He sings great on it," he told Parade Magazine. "It's a medley of 'Mona Lisas and Madhatters' going into 'Rocket Man.' I did it on Monday."
John had spoken in October of his plans to do the project with Morrison, who attended the Wednesday soiree.
"I'm supposed to be doing something with Matthew Morrison for his album," the singer told Entertainment Weekly in October. "[Matthew and I] had a little meeting together, so hopefully that's going to happen when I get to L.A."
No word yet on whether the high school glee club show will cover one of his songs, but John was enthusiastic about that possibility, too.
Morrison's solo album will be released in February.