Brother John has been a resident musician at Buddy Guy’s Legends in Chicago for 30 years. For more than a quarter of a century he has scoured the clubs of the city, taking turns on guitar or keyboards, when he’s not directing studio horn arrangements or playing keyboards on some albums, such as the latest Toronzo Cannon release, “The Chicago Way.” He has played with Eric Clapton, Steve Miller, the Black Crowes, and acquired ringing endorsements from many other musicians of renown.