Thanks to all the folks who answered questions about Jolie Blonde. I'm still learning but decided to do easier songs, like Bayou Pompon or Jai Passe devant ta porte. I will prob. get to Steve Riley's Jolie Blonde later, want more time with other songs. Still trying to figure out how to play in key of G on a C accordian. No clue how one would do key of F, but hear, one can. I have Larry Miller's book on Beginner Accordian. All 3 answers were great. Am really trying to get to know the songs real well, and humming them helps. A different can of worms is singing and playing the accordian or doing like a back-up rhythum. It's easier to just stop playing and let a guitar take over or a fiddle. Am finding, while playing with others that a good rhythum gitar really helps, when they back off because they may not really know the cajun song, it can be difficult. Still enjoying my beginner accordian though!

I think it's useful to learn how to play blend (2-note) chords quietly during jams while other instruments are playing or vocalists are singing -- it will reinforce your understanding of the songs, strengthen your familiarity with keyboard, and ultimately make playing melody much easier.

If you drop your left hand and keep your right-hand fingers in the "home" position (i.e., index finger on the 5 key and your other fingers on the 6, 7, and 8 keys), you can play pretty much all the basic blends you'll need:

In Key of C -
C = any combination of push keys (I usually use 5-6 push = G & C notes)
F = 5-8 pull (= A & F notes)
G = 6-7 pull (= B & D notes)

In Key of G -
C = same as above
G = same as above
D = 5-7 pull (= A & D notes)

Because many G songs don't have a lot of C chords, you may find yourself at times with the bellows fully extended. To avoid this, you can play a G octave (5-8 push) in place of the G blend, which will give you a chance to push instead of pull and get the bellows back where you're comfortable.

In Key of F (rare, but just in case) -
F = same as above
Bb = 7-8 pull (= D & F notes)
C = same as above