Explanations
Abbreviations are often used in chord names (alternative chord symbols in parentheses).
Bb - B flat major (Bb△)
Bbm - B flat minor
Bb7 - B flat dominant seventh
Bbm7 - B flat minor seventh
Bbmaj7 - B flat major seventh (Bb△7)
BbmM7 - B flat minor major seventh
Bb6 - B flat major sixth
Bbm6 - B flat minor sixth
Bb6/9 - B flat sixth/ninth (sixth added ninth)
Bb5 - B flat fifth
Bb9 - B flat dominant ninth
Bbm9 - B flat minor ninth
Bbmaj9 - B flat major ninth
Bb11 - B flat eleventh
Bbm11 - B flat minor eleventh
Bb13 - B flat thirteenth
Bbm13 - B flat minor thirteenth
Bbmaj13 - B flat major thirteenth
Bbadd - B flat add
Bb7-5 - B flat seven minus five
Bb7+5 - B flat seven plus five
Bbsus - B flat suspended
Bbdim - B flat diminished (Bb°)
Bbdim7 - B flat diminished seventh (Bb°7)
Bbm7b5 - B flat minor seventh flat five (Bbø)
Bbaug - B flat augmented (Bb+)
Bbaug7 - B flat augmented seventh