How do I add music to a Motorola smartphone?

A friend has a Motorola smartphone and I want to help her put music on the phone so she can play it in a dance class. The class system has an outie that fits into the headphone innie on phones. My iPhone doesn’t have the round innie, does her Motorola?

I have the music in files in my computer and in itunes and on a CD. She doesn’t have a computer. Does she have an app on her phone, that if I connect her phone to my computer I can copy them into her phone? Copy from where? My files or the itunes?

Thanks!