Songfacts®:

• The song borrows from singer/harpist Joanna Newsom's "Book of Right-On," a track from her 2004 album The Milk-Eyed Mender. Rather than using a sample, The Roots got Newsom to sing the hook for the song. Their collaboration came about as the Late Night With Jimmy Fallon house band work their Fallon day-jobs in the same building as Newsom's boyfriend, Saturday Night Live star Andy Samberg.
  
  "She's always around," Roots drummer and producer ?uestlove told Spinner. "I met them at a Dirty Projectors concert. I saw the Dirty Projectors for the first time [on the Fallon Show], became a massive fan and then put that video clip of them in my dressing room singing on the net. They said, 'Come to our show next week.' I went, and then I met Joanna Newsom and Andy there and it's like, 'Oh, be on our record.'"
• The Roots eventually used Newsom's originally recording. She told UK's Uncut in an interview for the January 2011 edition of the magazine: "It took us a while to get there, 'cos they initially wanted an original source track, so they had me come in and record with them a bunch of harp stuff as well as re-doing vocals. Then they ended up using the original recording! 'Cos my voice has changed so much that I can't even do an impression of myself singing a few years ago."