looking for iMovie audio loops (similar to Playful or Simple)

Hi folks,

I'm looking for some fun, children's themed audio loops for iMovie (iOS). Something like "Playful" or "Simple" songs shipped with the iMovie for iPhone. I'm using these two for most of my kids videos. But as you can imagine, it could get boring after a while to hear the same music in every video Any tips for free or even paid tracks? Thank you in advance!