If, as its faithful devotees seem to believe, the blues is a religion, then the Rhythm Room, at least for Phoenicians, is church. And this church, as club owner and gifted harmonica player Bob Corritore would have it, knows no limit to its worship. In July, the club hosted a live recording session featuring Robert Lockwood Jr., who at 88 is the last living Delta bluesman of note and, with his history as a Chicago session man in the 1950s, finger-picking style and love for 12-string guitar, is perhaps the most influential blues guitarist of the 20th century. The club's warm, full acoustics lent an added layer of gravitas to the proceedings, as did the presence of singer Jessi Colter -- Waylon Jennings' widow -- local blues guitarist Paris James, storied jazz drummer Chico Chism and local standouts like the Rocket 88s' Bill Tarsha in the audience. It was the most extreme recent example of what is on display constantly at the Room -- a love for the music, the Valley's most diverse crowd and the gleeful Corritore, who in his tastefully loud shirts and slicked black pompadour is an impossibly cool cat.