Thomas and the Little Einsteins Hearing Someone Singing

There's music in the air. Here's a musical picture I've made.
While Thomas was taking Leo, Annie, Quincy and June for a ride in his coaches, Annie and Clarabel, they suddenly hear someone singing a beautiful song.
It sounds so happy when it's heard through the air.
Who could be singing that wonderful song?
Note: I don't own anything, or the music.
Thomas & Friends © HIT Entertainment/Mattel Television and Nelvana.
Little Einsteins © Disney.
No money was intended to be made off this music video.
NOTE 1: No copyright infringement intended.
NOTE 2: I do not own the rights for these films.
NOTE 3: Under Section 107 of the Copyright Act 1976, allowance is made for "fair use" for purposes such as criticism, comment, news reporting, teaching, scholarship, and research. Fair use is a use permitted by copyright statute that might otherwise be infringing. Non-profit, educational or personal use tips the balance in favor of fair use.

[@jamesthereallyusefulredeng4162]

Annie and Clarabel: Where's that singing coming from Thomas

[@sailoralexisthesmalltankengine]

🥺 I wanna be a kid again!

[@blackkurama1662]

Let's listen carefully to see who is singing

[@dr.y47h]

Fifi from fifi and the flowertots

[@nicholaspeberdy8537]

Ye know, Christian. I can't upload any videos Robbie make.

[@SamKift2208]

did you make this

[@christiankirksey5931]

Robbie made this and I uploaded it.