I started years ago on guitar , then switched to bass ,had a break for a while ,learnt all my scales etc etc ,went back to bass and could not remember a thing ,keys thought they was for pianists so I play by ear these days because I'm to lazy to bother , but hey I get by ,no good learning all the theory if you don't enjoy playing ,my playing ability is errrr Okish depends on what I'm playing but no slap ,can't get my head around it