What's the best music player?

So unfortunately I've also been affected by the spotify apk failure, now I can't listen to music, cause I don't really have the money to spend on spotify premium. So I've decided to go back to the roots ams just download all my music and listen offline, now I would like to get you Opinions on what are the best free or one time pay apps and programs for music. Best case scenario would be that I also can similar to spotify change the output device from PC to mobile, Thanks in advance.