Blue Soul, another superlative offering from Dave Stryker, the jazz guitarist who has stuck a flag in ‘70s territory and claimed it for his own.  This newest recording is a collaboration with saxophonist/arranger/conductor Bob Mintzer and the WDR Big Band, the highly regarded German jazz ensemble.   It includes Marvin Gaye’s “Trouble Man’ and “What’s Going On,” three of Dave’s originals, and Mintzer’s “Aha.”  Prince’s “When Dove’s Cry” and Jimmy Webb’s “Wichita Lineman” are given the Stryker treatment, as well as Stanley Turrentine’s “Stan’s Shuffle.”