Hi kaeote,

I'm not quite sure that I understand the notation you are using. It seems to be a hybrid format. Do you mean a Bb7 with added 13th (that is, Bb-D-F-Ab-G) or do you mean a Bb13 (Bb-D-F-Ab-C-Eb-G)? In many situations, Bb13 is played using characteristic notes as Ab-D-G over a Bb bass. What notes were you wanting the chord to play?

Regards,
Noel


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