It's the classic ABC song with big and small letters.
Arranged and performed by A.J. Jenkins.
Copyright 2010 A.J.Jenkins/KidsTV123: All rights reserved.
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Kids songs song for children

https://open.spotify.com/artist/0zC8dOCRSyLAqsBq99du1f
https://music.youtube.com/channel/UC0EqNhs_ejTB7_EgTZzpixA
https://music.apple.com/gb/artist/kids-tv-123/1439675517
https://music.amazon.com/artists/B07JN5GWJC/kids-tv-123

The ABC Song

English Resource Description