Underworld 2011 Tour Info

[TheBang]

Based on this:

http://2011.sonar.es/en/tickets.php

it looks like Steve Reich is the only thing in L’Auditori, which is the only venue not covered by the other passes.

I think a "Sonar by Night 1- Night Ticket" is the one that you want. You might want to try calling the Call Center number on that page though, to verify.