I’ve be n using Astro for ages. I tried a few and found them bloated and missing something. Astro has some extra bits I don’t use but I never switched them on so it’s not an issue. You can hide anything you don’t use on the opening screen from the options too.
I acquire the MP3 of the song I want from where ever I can find it. Be that buying it, YouTube converter or elsewhere. Then copy it to the SD card on my phone to listen to. No ads, no data connection needed. I even bother to set the album covers and tags up so it is all searchable in the Oto app I use on my phone.