15th February
The episode is called "Sectionals" its the 13 episode of Glee's 1st season. Loakleyxx
13 days
Season Four of Glee aired between September 13, 2012 and May 9, 2013
Season Five of Glee aired between September 26, 2013 and May 13, 2014.
I'm not sure which season you mean so heres both episode 13.... Season 1 Episode 13: Sectionals which aired on December 9th 2009 Season 2 Episode 13: Comeback which aired on February 13th 2011 Hope this helps!
They are doing "Sing" in Season 2 Episode 13-Comeback
Adam Lambert first appears in Glee Season 5 beginning with Episode 4 on 11/07/13. He then appeared in Episode 7 which aired 11/27/13. He will be in more episodes in 2014.
There are two: season one, episode 13 "Sectionals" Season 3 episode 14 "On My Way"
Season 1 episode 13 'Sectionals' is Where Santana says that line.
13 September 2012 is when the first episode is being aired
September 13, 2012 at 9/8C.
The song was an untitled piece that was not included on any of the Glee released albums.