Originally Posted by: WeslabaI just wrote out a bunch of scales, and did out the chord charts and everything, and I can see how it works together, but could someone please explain in depth how the 7th and 9th chords, even 11th and 13th fit into those keys, its just not clicking in, and hasn't for awhile, so I would love to be able to get this out of the way. Its killing my creativity and I hate it. :mad:

One key thing that is throwing me off is the 7th chords. The b7 and I aren't getting along very well.

All of the chords in a key are built from the notes pertaining to that key.
The key of Bb is..... Bb-C-D-Eb-F-G-A
If you tried to build a Cmaj7 in this key, it would never work. The notes needed would be; C-E-G-B (1st,3rd,5th,7th)
To remain in key the notes need to be; C-Eb-G-Bb (1st,b3rd,5th,b7th)
which becomes a Cm7 chord.
To make a Cm9; Notes C-D-Eb-G-Bb (1st,2nd,b3rd,5th,b7th) but it's written C-Eb-G-Bb-D (1st,b3rd,5th,b7th,9th) because (2nd and 9th are both note D) the pitch class emphasized (9th) is above the Octive; 8th=C, 9th=D. Intervals above the Octive are known as Compound Intervals (9th,11th,13th)
Nor would a Fmaj7 fit in that key; F-A-C-E (1st,3rd,5th,7th) needs b7th, Eb.
But an F7sus4 does; F-Bb-C-Eb (1st,4th,5th,b7th)

How many of these chords would fit in the Key of Bb??????
Gm7
Am7
Dm7
Dm9
Ebmaj7
Ebmaj9
Ebmaj13
Am7/b5