Rachel Platten, The Lumineers, Shawn Hook, Hudson Thames

Young Hollywood’s “Backstage Diaries” gives you an all-access pass to some of your favorite musical acts. This time around, we head to the iHeartRadio Theater for The Lumineers’s album release party to get the backstory on how they first came together as a band, then we catch up with singer-songwriter Rachel Platten during her tour rehearsal to discuss the inspiring message behind her “Fight Song”. Later, star-on-the-rise Shawn Hook experiences his first trip to SXSW as a performing artist, and finally child actor-turned-musician Hudson Thames tells us the origins of his hit “How I Want Ya” and how actress Hailee Steinfeld became involved.