MP3 files into Amazon Music?

[LeadFarmer]

I have a small number of mp3 music files that I'd like to be able to have on my iPhone to play, so is iTunes the only way?

I have Amazon Music which I don't think lets me upload personal music files. Shame I can't just add them to my Amazon list and have all my music in one place.

Is iTunes really the only way?

[The_Jackal]

Surely there is a generic music player app to download from the store?