Chord & FretAm7(b5) — half-diminished
Notes in Am7(b5): A – C – Eb – GFormula: 1 – b3 – b5 – b7In the formula, the numbers count steps of the major scale starting from the note that names the chord; "b" lowers a half step, "#" raises one — and a slash names the bass note.
Picture a minor chord whose fifth has been 'shrunk', that is, lowered by a half step: the result is tense and melancholic at once. In minor keys it usually announces that tension is on the way — as in Bm7b5 → E7E7E7E7 → AmAmAmAm. It is a color you hear a lot in bolero and bossa nova.
The same chord on all four instruments
Where to use it: In minor keys it is usually the chord that opens the famous ii–V — in other words, the two-chord pair that prepares the return home. Think Dm7b5 → G7G7G7G7 arriving at CmCmCmCm.
Every region of the neck hides more shapes of Am7(b5). In Chord & Fret, you check it note by note, playing any shape as an arpeggio; open every variation on the neck, grouped by bass note; and set a capo — the diagrams redraw above it. Start free. Unlock everything with Pro. Plays offline.
See the whole neck in Chord & Fret →Part of the Sevenths family.