Oh, Didn't They Ramble

What is American roots music? Any definition must account for a kaleidoscope of genres from bluegrass to blues, western swing to jazz, soul and gospel to rock and reggae, Cajun to Celtic. It must encompass the work of artists as diverse as Alice Gerard and Alison Krauss, George Thorogood and Sun Ra, Béla Fleck and Clarence “Gatemouth” Brown, the Blake Babies and Billy Strings. What do all these ar...