His tour is called “Traffic Jam.” Dave Mason, 77, is still vital and on the road. The British legend who was in Traffic and Fleetwood Mac, wrote “Feelin’ Alright” for Joe Cocker, and collaborated with Hendrix, Rolling Stones and McCartney, will have his Only You Know And I Know memoir published in September (the title comes from the song he write for Delaney & Bonnie). The band Mike Love fronts and calls the Beach Boys are also on the bill.