indie rock alternative alternative rock alternative pop rock Do They Know It's Hallowe'en? (feat. Beck, Feist, Arcade Fire, Devendra Banhart, Elvira, David Cross, Rilo Kiley, Wolf Parade and Thurston Moore, Peaces, Dntel, Karen O) Do They Know It's Halloween? (feat. Arcade Fire, David Cross, Feist, Islands, Rilo Kiley, Sonic Youth, Sparks, Subtitle, Sum 41, Tagaq, Wolf Parade, and Karen O of The Yeah Yeah Yeahs)