Nate is learning to play guitar. A while back we bought him a small acoustic guitar with the idea of eventually getting him lessons. He has since outgrown it, but he is now learning how to play on his father's guitar.
He is very quick to learn and eager to play, far more so than he ever was with piano (but ah, the groundwork had been laid). If fact his teacher is greatly impressed by his progress each week.
Unfortunately he only plays one recognizable tune, the classic coda from Black Sabbath's Iron Man. Which is not a bad song, but when you hear it over and over- day in and day out it gets a little tedious. I'm glad he is so enthusiastic to practice, I just wish there was a bit more variety.