Almost alphabetical, I put my favorite for each letter first. Inspired by @TQ
  1. Alvvays
    And All-American Rejects
  2. Best Coast,
    Band of Horses, Beach House, Beats Antique, Belle & Sebastian, Black Keys, Broncho and Bully
  3. Chet Faker
    And Café Tacvba
  4. The Drums
    And Devotchka
  5. Edward Sharpe & the Magnetic Zeros (twice)
  6. Father John Misty (twice),
    Fall Out Boy, FKA Twigs, Flaming Lips, Flume, Foo Fighters and fun.
  7. Grimes (twice),
    Grizzly Bear and Grouplove
  8. Holy Ghost!
    And Hot Chip
  9. Jake Bugg,
    Jane's Addiction and Joy Formidable
  10. Kendrick Lamar
  11. Local Natives,
    LCD Soundsystem, Lord Huron and Lumineers
  12. Melody's Echo Chamber
    And Modest Mouse
  13. Neon Indian
    And New Order
  14. Of Monsters and Men
    And OneRepublic
  15. Purity Ring,
    Panic! At the Disco, Passion Pit, Pennywise, Peter Bjorn & John, Poolside and Postal Service
  16. Red Hot Chili Peppers (twice),
    Rebelution and Rodrigo y Gabriela
  17. Snakehips,
    Santigold, Script, Sigur Rós and Steel Pulse
  18. Toro y Moi,
    Tame Impala (twice), Tanlines (twice), Taylor Swift, Tegan and Sara, Tennis and Twenty One Pilots
  19. Vampire Weekend
  20. Wild Nothing
    And White Arrows
  21. The xx
  22. Yeah Yeah Yeahs
    And Young the Giant