And they've continued producing good music over the years. Something remarkable, in and of itself.
Their style has changed a bit. In particular, as they've become older (and one of them -- John ;) -- became a parent) they've started to do children's songs. And they're still good.
The only downside is that now I'm getting their songs stuck in my head and walking around the house singing "I can add! Yes, I can add!" to myself over and over. (At least it contains a nifty dancing squirrel.)