text: anyone know who sang the song used on er comercial this week? lokking for the halalua song used while the character abby was at the crash site of the bus it was the rufus wainwright version of  "hallelujah", which was written and originally performed by leonard cohen.  it has been covered many many times.  here is a list:  leonard cohen - hallelujah  jeff buckley rufus wainright bob dylan (live) bono (u2) dresden dolls (live) k.d. lang  damien rice (live) sheryl crow - hallelujah (live radio) the junebugs (live) tony lucca  elisa chris botti clare bowditch eric beverly erik flaa euan morton & denise summers (live) arooj aftab  allison crowe gavin degraw jack lukeman john cale john jerome kate noson  katheryn williams  k's choice (live) late tuesday (live) lucky jim  macbrolan  ari hest (live) imogen heap street to nowhere jennifer terran brandi carlile