Studies have shown that the jazz scene is dominated by men, but saxophonist Mary Petrich isn’t too hung up on that. “I just want to keep my head down, work hard, become a better player and encourage others to do the same,” she says. She and pianist Claudia Bloom are implementing this ethos and empowering young musicians through Phoenix Jazz Girls Rising, an all-female musical mentorship program presented by The Nash. The Phoenix jazz club...