A major chord on the flat 3rd, borrowed from the parallel minor, bridging 1 and 4. Parallel-triad muscle: AC/DC to Nirvana runs on this move.
hear it in “My Sharona” — the 1 · b3 · 4 riff
Lead-in — how players set it upPower-chord riffs launch it straight off 1.From b7 — stack the borrowed majors before sliding up.Or from 5⁵ power motion, keeping the 3rds out of it.Follow — where it usually goes4 can ride to 5 or drop back through b7.Ride 4 up to 5 for the full parallel-major staircase.Or fall back: b3 to b7 to 1, borrowed all the way down.
Blues scale carries the b3 chord natively — the key's b3 IS the chord's root; bend into it from 2.Target tones (in C)C — lean on E (3)Eb — lean on G (3)F — lean on A (3)Half-step wiresE ↘ Eb · Bb ↘ A