Spirit, not sound, defines SFJazz lineup: Aidin Vaziri | The San Francisco Jazz Festival is set to return with another ambitious run of concerts that spans generations and genres. Yes, there will be plenty of straight-up jazz on offer as the nonprofit organization rolls into its 28th season, but there will be several more unexpected guests on hand to mix things up, such as Grammy-nominated R&B sensation Ledisi, the Western swing group Asleep at the Wheel and singer-songwriter Rosanne Cash, the daughter of country star Johnny Cash. Randall Kline, the executive director of SFJazz, said when it came to booking this year’s festival, which covers various venues across the city between Sep. 24 and Nov. 14, it was about the spirit, not necessarily the sound. “I like to say we present music that jazz has influenced and music that has influenced jazz – which basically means anything,” he said. “I’m just looking for a certain soulfulness.” Read more.