I need help!

Hello, has anyone seen friends the one that could have been Pt 1? If you have then can you tell me what the name of the song is at the end and who it is by? It's the one that fat Monica is dancing to and I've been trying to find out what it is every where (Even google) and have not found it, and I really want it. 🙁

the only reference to music in that ep i could find is Frederick Chopin, "Nocturne in E flat, Opus 9, Number 2" but im not sure

I don't think thats it, he does classical music, thanx anyway.