For Mike Campbell, External Combustion – the second album by his first band as a leader, The Dirty Knobs – is proof that lightning can strike twice. The follow-up to their 2020 debut Wreckless Abandon beats a new set of odds and jumps ahead in vision and drive, proving the first record was no one-shot deal. Campbell experienced all of the above and more with Tom Petty and the Heartbreakers – riding shotgun with his friend and captain as lead guitarist, co-producer, and, at times, co-writer – when he met guitarist Jason Sinay at a session in Los Angeles in 2000. Once Lance Morrison joined in on bass and Matt Laug on drums, that turned into The Dirty Knobs, named after a faulty amp dial.