Tinashe, whose hit "2 On" was produced by DJ Mustard, performs on stage in December. Emmerson/Corbis hide caption

itoggle caption Emmerson/Corbis

Barbra Streisand during a recording session in Burbank, Calif. Jason Merritt/Getty Images hide caption

itoggle caption Jason Merritt/Getty Images

John Legend's latest album, Love in the Future, is out now. Legend also appears on the soundtrack album for the film 12 Years a Slave. Courtesy of the artist hide caption

itoggle caption Courtesy of the artist

John Legend performs at the Tiny Desk Concert on Wednesday, October 23, 2013. Abbey Oldham/Abbey Oldham/NPR hide caption

itoggle caption Abbey Oldham/Abbey Oldham/NPR

John Legend and The Roots perform on World Cafe. Doug Seymour hide caption

itoggle caption Doug Seymour

Junip, a new project from Swedish singer-songwriter Jose Gonzalez (center). Jon Bergmann hide caption

itoggle caption Jon Bergmann