I play guitar and piano by ear, but one time several years ago, I decided I wanted to learn to read music, so I took lessons for a brief time (no longer retain any of what I learned). Anyway, after a couple months of lessons, it was time for my "recital." It was at a ocal church and I was the only adult - the rest being little kids. Well, when I came time for me to play, I sat down at the piano and started playing the music that was in front of me - Fur Elise. After a few bars, I lost my place - panicked and, not wanting to look like a complete idiot (I know, too late), I spontaneously broke into "Let it Be" which I played by ear and could play in my sleep! It wasn't what I was supposed to play, but the audience seemed to like it!