After the wiggling, flopping, and humming settles into snuggling my two Littles start noticing Grace's piano music. Lately Grace has been starting her sessions with "Star Wars" themes because she knows the Littles enjoy it.
The first time Grace sight-read through Darth Vader's Theme I was still in the Littles' bedroom watching them settle down. I could see Jack's eyes looking off into space as he relaxed into his pillow, his eyes tracking from side to side as Grace played. At her first stumble his eyes froze, only to resume tracking as she resumed playing. Anytime she had to pause to work out the music his eyes stopped tracking and he almost seemed to hold his breath, waiting for the musical resolution.
I'd love for both Littles to be musically inclined but if the end result of their early exposure to music is merely less time required memorizing math facts... it's all good.