This is a song from StoryBots: Learn to Read Collection 3. It's sung by Gabe Sokoloff.
Lyrics[]
C and H, those two great letters
Make a whole new sound when they hook together
And the sound is /t͡ʃ/, it's the one you'll find
On the choo-choo chugging on the C&H line
When the choo-choo's coming, all the children cheer
A chimp named Charlie is the engineer
He pulls the chain on the whistle and he rings the chime
On the choo-choo chugging on the C&H line
CH goes /t͡ʃ/ in chili and cheese
Chimneys, churches, and cherry trees
Chubby chinchillas doing their chores
Or straight up chilling in the great outdoors
Yeah, C and H make a charming pair
In words like chocolate, chicken, and chair
'Cause together they're /t͡ʃ/, keep that in mind
When the choo-choo's chugging on the C&H line
The choo-choo's chugging on the C&H line