Saxophonist & composer John O’Gallagher joins Pablo Held to talk about sound and projection on the alto saxophone, his PhD research on late-period Coltrane, and how pitch-class set theory shapes his music. Other topics include stories behind the making of his new album ‘Ancestral’, playing together at Pablo’s ‘Alice Coltrane Tribute’ concert in Cologne, recording on Joe Henderson’s big band album, memories of Andrew Hill, and much more.