Jeff Tweedy, Mel Robbins, Jesse Welles, Ilia Malinin

SUNDAY PROFILE: JEFF TWEEDY – Anthony Mason heads to Chicago for a visit with Jeff Tweedy, front man for the popular band WILCO. The four-time GRAMMY winner talks about his long career and his latest solo work, which critics call some of his best.IN CONVERSATION: MEL ROBBINS – Norah O'Donnell stops by best-selling author and podcast sensation Mel Robbins' office in Boston, where Robbins opens up about how she leveraged her own struggles to shake up the self-help world.TAKE NOTE: JESSE WELLES – Robert Costa sits down with GRAMMY-nominated singer-songwriter Jesse Welles, who is helping bring folk music back to the mainstream.QUAD GOD – Ahead of this week's Winter Olympics in Italy, Jonathan Vigliotti hits the ice with Olympic hopeful skater Ilia Malinin, known as the "quad god" for his unique ability.ON THE HUNT – Ted Koppel ventures into the woods of the Arkansas Ozarks to tackle the thorny issue of black bear hunting.NAME THAT TUNE – David Pogue takes a walk down memory lane with the stories behind some of our most beloved TV theme songs.THESE UNITED STATES – ON THE RECORD – On GRAMMY Sunday, we'll celebrate the man who started the music revolution way back in 1887 – Emile Berliner, inventor of the "gramophone."