Here are some fun sites with songs for kids to sing along with!
Mightybooks.com is a site full of songs and stories for little ones.
Some of the site is by subscription only, but they also have lots of free stuff. Here are some animated story songs
and here are some short classic songs.
Speakaboos is another great site full of stories and songs that has a subscription section but also several free items as well.
Here are pages of songs and a search engine where you can search by author, celebrity, grade level, reading level, and if the songs are free or not.