Alarm app with MP3 feature ??

Since changing to Windows 10, I have been completely unable to find a free alarm app that will let me wake up to a selected MP3 file. Many of them say they will, but in the end it turns out that they wake me to whatever beep or chime they feel like using.

It would make a huge difference in my day if I could work this out. Is there an app that you HAVE USED, and know will actually work for this? As I’ve said, I’ve tried several that say they will do it, but don’t.

File type is not terribly important, I can convert it, I just want to be able to wake up to the song that I set.

Thanks for any feedback you can give!