THE POP LIFE Royalties From PBS Dismay Bluesmen By NEIL STRAUSS Published: September 25, 2003 On Sunday PBS is scheduled to begin its weeklong documentary series "The Blues," with Martin Scorsese as executive producer. In the episodes, directed by Clint Eastwood, Wim Wenders, Mike Figgis and others, the past, present and future of the blues are honored, explored and explained. But some record labels and music publishers say there is one old blues tradition being honored by PBS that would be better off left in the past: underpaying the artist. Randall Wixen, president of Wixen Music Publishing, says PBS offered...