Now that I've a pair of Airpods I'm again interested in finding if there's an app that will allow me to play my music, ripped from my CDs or purchased from Amazon, on my iPhone or iPad. E.g.: I've created a "Music" folder in my iCloud Drive. Ideally I could point a music player app at that directory and it'd Do The Right Thing. Or at least let me manually drill-down into a sub-folder containing mp3's, select the first one, then play everything in that folder, in order. Ideally, said app would have controls on my Apple Watch. I also don't care if I have to first transfer the music to my phone or tablet. I can live with that, too. I don't care if it's paid or free (w/o adverts!), as long as it actually works. Thanks!