The boys are starting to sing songs other than Twinkle Twinkle and the ABC song by themselves. This is the rendition of Farmer in the Dell I heard Ethan singing while playing with Playdoh this afternoon:
"The farmer in the dell, the farmer in the dell- I know the derry-o, the farmer in the dell..."
It went on like this for a few repetitions until he moved onto something else.
Makes perfect sense if you know what the heck a derry-o is!