Below are a few of the sites that I have found useful in my teaching. Maybe they will help you too! Some of them are informational and some promote creativity and artistry. Imagine the ways you could use them in YOUR teaching!
MusicPlayOnline - huge shout out to Denise Gagne for all the work they've done to make music education accessible during this time (and before!)
The Music Podcast for Kids
Midnight Music - so much there that is so helpful. Her podcasts are tremendous and helpful!
Pear Deck - a terrific way for delivering instruction and assessment both online and in person.
Classics for Kids
Patatap
Typedrummer
Chrome Music Lab
Online xylophone
Blob Opera
They Rhythm Trainer
The Rhythm Randomizer
Groove Pizza