Any good music making apps for casual users? Simple loop mechanics

My kids (6,8, and 10) have been showing interest in music making. They have been using DJ loop pads (link below) and it works for the most part, but I'm looking for something better. Preferably something that's free or a single purchase without loop packs and stuff hidden behind microtransactions. https://play.google.com/store/apps/details?id=com.mobiray.djlaunchpad