Angeles Times blogs . http://latimesblogs.latimes.com/showtracker/2009/08/neil-patrick-harris-signs-on-to-judge-american-idol.html . Retrieved 19 September 2009 .   ^ "Dream On" . Glee . episode 19. series 1. 18 May 2010. Fox . http://www.fox.com/watch/glee/86300729001 . Retrieved 19 May 2010 .   ^ Christopher said... (October 23, 2009). "Neil Patrick Harris is on Batman tonight (and he sings!)"