I play guitar, almost always, in an open tuning and finger style, I have no 'sense' of chord sounds but for most song accompaniment I have no problem playing something (melody and bass line) that works. I also play english concertina. Therein lies my current problem-I still have no chord 'sense' but neither can I remember a damn tune. I can play fine from the dots but not from memory. I find this incredibly frustrating and what is even more frustrating is that doing what everyone says that you need to do to solve the problem is to PRACTICE- doesn't work. it's not as if I make the same mistakes in a tune, each time, they are different mistakes! Not with guitar, mandolin,flute those I can remember. Any suggestions would be welcome however the one that goes-practice hasn't worked so far chris