I’ve never let my kids watch cocomelon (or much screen time at all).
But we do listen to cocomelon. It has some legitimately well done music IMO. For example “over the river and through the woods”.
Especially the albums Here come the 1, 2, 3s and Here Comes Science.
My wife and I really enjoyed Caspar Baby Pants and Laurie Berkner for kids music.
[1]https://www.youtube.com/playlist?list=PL86-PnO8H7d9uS59c0f6-...