Who sang Opera Lullaby?

[diannadinoble]

I was just watching episode 4078, and a woman named Denise sang Elmo an Opera Lullaby. For some reason, I think it's the funniest thing ever - likely because of the opera sheep

I can't find any information on who Denise is, does anyone know her last name? She has such an amazing voice.

 

[MuppetDude]

That would be Denyce Graves.