I've just posted this on another post, but just in case U guys don't c it, here it is, & can make for some nice Talk music:
here is a simple example of what U can do with just the 6, 3 & 4:
below is a 6-3-4 progression on which I just expand for illustrative purposes:
Key of Bb
G/ G-Bb-C-D-F (suggestion: play LH G with any mid finger, but not thumb or pinky..U'll c why )
D-D/ F-Bb-C, D
Eb/ G-Bb-D (hold for 2 secs), Bb,D
(repeat)
or move to
D-(D)/ F-A-C
G/ F-G-Bb-C-D
Eb/G-Bb-C-F
D/F-A-C-Eb
Eb/G-C-D-F
G/F-G-Bb-D
D/A-C-F try LH chord an octave lower than others sometimes
Eb/D-F-G-Bb
(repeat from top or mid)
hint: play each chord a couple of times, arpeggiating it for the best results.
I added the second part of the progression just to illustrate the endless options of what 1 can do with the 6, 3,4 .
Another exercise which could be fun is to play around the 6, 3& 4 using only 1 chord in the RH, eg, the Bb+6 chord (D-F-G-Bb)..just play the chord in different inversions using those bass notes
& c what I mean..
best wishes.