Um, guys, Baz Luhrman released the film of MOULIN ROUGE! in 2001, some 8 years before GLEE came on our TVs. If anything, one might speculate that Ryan Murphy got the idea from Luhrman.
But medleys were common long before they were called "mash-ups". They were a staple on variety TV (including THE ED SULLIVAN SHOW in the 1950s, THE CAROL BURNETT SHOW in the 1960s, and SONNY AND CHER in the 1970s) long before Luhrman or Murphy were making films or TV shows.
Also, Lima, Ohio, was famous because of the "wrong" pronunciation. I have no idea where in Ohio it is, but I know it's there because it isn't pronounced "LEE-muh" like the capital of Peru.