Mike Finnigan was a 19-year-old student at Kansas University when he became the proud owner of a Hammond B3 organ. “I put it in the kitchen of this apartment I lived at with this guy.

Trumpeter Gilbert Castellanos co-founded the Hammond B-3 Quartet with L.A. organ master Joe Bagg, tenor saxophonist Brian Levy, and drummer Duncan Moore. The B-3 organ has a storied tradition in ...