The bedrock of David Guetta's Nicki Minaj-featuring single "Hey Mama" is a sample of "Rosie," a 1940s prison recording from folk archivist Alan Lomax that songwriter Esther Dean first showed the French DJ on YouTube.
"Feel It Still" by Portugal. The Man deals with lead singer John Gourley becoming a "rebel just for kicks" after having a daughter and settling down. "It's hard to be a punk when you're thinking about your baby daughter at home," he says.
"Bittersweet Symphony" by The Verve samples an obscure orchestral arrangement of the 1965 Rolling Stones song "The Last Time." The Verve had to sign away most of the royalties before they could release the song.