Sandar Boyton books are great - but the music CDs I found a bit wanting and painful to listen to.

I highly recommend:

1. "Dinosaurs and Dragons" by Kevin Roth.

2. "Hot Dog" and "Sing Along" by Caspar Babypants (aka. Chris Ballew)

3. Saturday Morning Cereal Bowl podcasts: https://saturdaycerealbowl.podbean.com/

The Halloween podcast is one of my favorites

My son loves to listen to all of these.

Seconded -- we've found them to be excellent road-trip music, too.