The Best Music-Based Halloween Costume This Year

Popular culture is ripe with costume ideas. Some kids, but mostly adults and college goers, dress up as Lady Gaga or Ozzy. However, not many acts these days have a distinguished enough appearance to inspire a costume. Today, I saw this group of kids on BuzzFeed and smiled. They have the cleverest music-based costumes I've seen in awhile. That is, unless someone dressed up as LimeWire this year, because that's awesome. See if you can figure it out:

Highlight the following text for the anwser: Vampire Weekend.