https://www.microsoft.com/en-nz/store/p/free-music-mp3-downloader/9wzdncrfhvhx

The above is a link to a free mp3 downloader I have on my Windows Phone, which works really well. As you may know I'll be moving to Android shortly (just waiting on my case etc to arrive). Is there a similar app I can get for Android that anyone can recommend? I looked at Google Play but having to pay an ongoing fee every month when I may or not download some music doesn't appeal. Even some subscription where I could pay per song would be okay.

Any suggestions welcome, thanks