The second season of "Glee" doesn't start for another week -- but we've got a sneak peek at one of the songs from the first episode ... and a good look at John Stamos in his guest appearance!
In the premiere, New Directions tackles Jay-Z and Alicia Keys' "Empire State of Mind." Check out the audio above!
We also got our hands on some new preview pics from the new season, which show Stamos as Emma's dentist/love interest.
"Glee" premieres September 21.
