Ive played piano since I was 5 (in a few popular new jersey cover/wedding bands as well). Can't read a lick sheet music. I learn using Fake Books (chord plus melody). I can play a Bruce Springsteen song, but anything classical would ruin me. There's an app that lets you look up the chord progression for any popular song. So if there's something I don't know, I just look it up there and play it on the spot. Much better way to "play piano" if it's not your career. But anyone who can read sheet music, I envy.