Chickenpox

The story:

Well I was only six and we had to dance to this song
for "aerobics" at school. Every little kid dancing
and singing is just listening to themselves. I don't
think anyone heard me say Chickenpox. but hey. it's
worthy. I didn't clue onto the fact it was in fact
"She's a Mod" until I was well into my teens...
clueless autism spectrum person here. I just thought
it was a song about chickenpox.