i have used this chord progression within a chorus of a song: Bb7, Ebmaj7, Eb7, Ab, Bb7, Ebmaj7, Eb7 but i have been trying to figure out what key my song is in, when the verses have the progression Fm7/9, Ebm7/9, Dbmaj7. i think it's in Bb natural minor but what do you think?
we're missing a lot of information without any melody or any rhythmic context for the chords. but the verse looks like Db, and the chorus looks like probably Eb