Leonard Bernstein’s Young People’s Concerts with the New York Philharmonic are excellent. Bernstein recorded these for CBS from 1958 to 1972.
My three daughters and I just finished watching all 25 programs in this Special Collector’s Edition 9-DVD Set. Each program is a little under an hour, and we watched one together each Saturday morning.
Bernstein was a prodigiously talented conductor, and he was also a gifted pianist, composer, and music lecturer. And to top it all off, he was skilled at teaching children about music. He makes complex musical topics easy to understand—simple enough for children to understand. And it’s not just for kids: I learned something new in every single episode.
I highly recommend his Young People’s Concerts (not his ethics or politics). You can read some of the scripts here, and you can view some of these concerts online for free. For example, here’s one called “Who Is Gustav Mahler?” (script):