Heartwarming / Rock Band

• The ending blurb of the the announcement of the end of the weekly DLC run.
  Announcement: Whether you waited in line for a midnight release of Rock Band over 5 years ago, or you just joined the party with Rock Band Blitz… whether you’ve downloaded every single song we’ve ever released, or you’ve just played on disc songs until your neighbors moved away… whether you’re a metal shredder, or a bubblegum pop singer… thank you for being a part of our band.
  • Even more heartwarming: two years after the announcement, new DLC returns. One of the new songs, released for free, is "I Still Believe" by Frank Turner, an incredibly happy, upbeat song about rock and roll uniting people in friendship.
  "Now who'd have thought that after all
  Something as simple as rock 'n' roll would save us all.
  And who'd have thought that after all, it was rock 'n' roll."
• Boot up Rock Band 2's tutorial and it takes you to learning how to play Seven by the studio's in house band Vagiant (now called Tijuana Sweetheart). Why is this a CMOH? Because it's Harmonix's love letter to the Violently Protective Girlfriend trope, that's why.
• It was a very sweet moment when Harmonix, which at the time thought that the Rock Band franchise was coming to a close, announced Don McLean's "American Pie" as the final DLC and performed it (the long version even) before a crowd of fans as a send off to the games.