This is Sample Size, our weekly new music feature with KOSU's Ryan LaCroix and LOOKatOKC pop music columnist Matt Carney.
Today, we celebrate the musical guests of Late Show with David Letterman, and play a disorienting surf-rock tune from La Luz and a live D'Angelo cover of a Prince song for Spotify.
Follow Matt & Ryan on Twitter at @OKmattcarney and @KOSUryan.