I stumbled over this doodle this morning, it's in honor of Les Paul's 96th birthday (he died in 2009). It is fully playable, you can strum the strings with your mouse, or use the keyboard keys a thru l. A thru k is a full scale, with the letter "L" being the note right after the top end of the scale. After getting familiar with the key layout, I came up with this song. Will warn you, this might be as addictive as when Google Doodle was set up as Pac-Man for the day, in fact, Google had an old lady call Google and ask them to turn it off. LOL
My Google Doodle Song