Knowing that he says "all done" I figured this is what he was saying. But he kept chanting the line over and over. Then I realized what he was getting at; he was singing "Ring Around the Rosie." Jeff shook his head over the first recognizable song being about smallpox. Go figure.
Sometimes his singing will be an amalgamation of all the songs he knows and it sounds like he is just composing his own. It's not bad, either. He obviously has his daddy's musical genes.
In this way, he's also starting to "count." When we heat up his bottle in the microwave, we count down the seconds. He has begun imitating the tone and approximating the sound of the numbers. Smart baby!