Jonathan Meiburg explains how Vic Chesnutt's "Big Huge Valley" helped him realize there was a whole world of music bubbling beneath the mainstream. Plus, he makes the case that Nina Simone is the "best popular musician of the 20th century, and maybe the 21st century too." Then Emily Cross of Cross Record describes the effect Imogen Heap's "Hide and Seek" had on her while her partner Dan Duszynski explains how King Tubby expanded his ideas of what music could be.