Lately, he has started lip syncing to the songs. He doesn't actually sing along, but he is definitely lip syncing all of the words, even the faster songs. It is cute, he really gets into it and has some great facial expressions to go along with the lyrics. I watch him and I can see how if he were actually vocalizing, how he would be mispronouncing things. So I use it as a little bit of speech practice, cuing him to keep his tongue back for the "s" sound and all that, "singing" along with him while modeling proper form. Somehow it seems easier for him to form the words when he doesn't have to put the sound with it.
For a guy who struggles mightily with the rate of his speech--it usually takes awhile for him to form sentences and responses--it is fun to see him "singing" these up-tempo songs. And I am definitely glad that we are no longer in the days of tape players, where I would be spending quite a bit of time rewinding to find the beginnings of songs when a word is missed and the whole thing needs to be started again!