Apple iTunes is further making its mark on the live music scene in London with the launch of 11 nights of free collaborative concerts starting next week. The unique acoustic performances include sets by KT Tunstall with fellow singer songwriter Billy Bragg (Feb. 24); former Moloko vocalist and now solo singer Roisin Murphy dueting with pop veteran Tony Christie (March 1); and alternative acts Nick Cave and The Bad Seeds teaming with Spiritualized (March 2). (Billboard)