January, 2010:------------ 250,000 paid subscribers
March 17, 2010:----------- 320,000
July 20, 2010: ---------------- 500,000
December 8, 2010: ------ 750,000
March 8, 2011:--------------- 1,000,000
July 14, 2011: -----------------1,600,000
Sept 21, 2011: ---------------- 2,000,000
Nov 23, 2011: ------------------2,500,000 paid subscribers
http://www.spotify.com/us/blog/archi...g-subscribers/