Both our kids grew up with this Sandra Boynton book…
use_synth :piano
play :c4
sleep 1
play :d4
sleep 0.5
play :f4
sleep 0.5
play :f4
play :a4
sleep 1
play :d4
play :f4
sleep 0.75
play :f4
sleep 0.25
play :g4
sleep 1
play :d4
sleep 0.5
play :e4
sleep 0.5
play :c4
play :f4
play :a4
sleep 2