Explanations
Abbreviations are often used in chord names (alternative chord symbols in parentheses).
Ab - A flat major (Ab△)
Abm - A flat minor
Ab7 - A flat dominant seventh
Abm7 - A flat minor seventh
Abmaj7 - A flat major seventh (Ab△7)
AbmM7 - A flat minor major seventh
Ab6 - A flat major sixth
Abm6 - A flat minor sixth
Ab6/9 - A flat sixth/ninth (sixth added ninth)
Ab5 - A flat fifth
Ab9 - A flat dominant ninth
Abm9 - A flat minor ninth
Abmaj9 - A flat major ninth
Ab11 - A flat eleventh
Abm11 - A flat minor eleventh
Ab13 - A flat thirteenth
Abm13 - A flat minor thirteenth
Abmaj13 - A flat major thirteenth
Abadd - A flat add
Ab7-5 - A flat seven minus five
Ab7+5 - A flat seven plus five
Absus - A flat suspended
Abdim - A flat diminished (Ab°)
Abdim7 - A flat diminished seventh (Ab°7)
Abm7b5 - A flat minor seventh flat five (Abø)
Abaug - A flat augmented (Ab+)
Abaug7 - A flat augmented seventh