Rumble: The Indians Who Rocked the World (premiering on Independent Lens on PBS on January 21st, and also available simultaneously for online streaming at www.pbs.org) is a documentary that explores how Native American musicians transformed blues, jazz and rock, with stories that are told by some of the music legends who knew them, played with them and were inspired by them. From the Native and African American roots in the early pioneers of the blues, to one of the first and most influential jazz singers who was trained on Native American songs, to the Native American folk rockers …