Our behavioural therapist has come up with an interesting theory about Alex's reciting, singing and knee-jerk complaints to questions or instructions. Basically, she thinks his internal monologue is set to external.
If he's singing the same song over and over again, it's because he's got an ear-worm. If he's reciting a scene, the same thing except with dialogue instead of a song. His reflexive "No <blank>" response to any question would be the equivalent of our mental "ugh" when asked to do something distasteful.
It doesn't really change much on how we're handling it. Regardless of the source, he has to be taught that there are times it's not appropriate to bellow Bon Jovi at the top of your lungs (no matter how good your rendition is). Ditto reciting endless lines of dialogue from Super Grover 2.0. And there are also times when it's best to keep your reactions to yourself.
But it does suggest that we're getting an interesting insight into his inner world. I've often wished for thought bubbles or subtitles so that I could understand what was happening inside. Now it looks like I may well have that chan