idk
but have you done a google search for
the name of the file?

Searched your browser history?
Would the mp3 be dated when you received it or when it was created?

If you end up reposting this question you might get a better response if you include a bit more in the title, like Does anyone recognise this 1970s Scottish male folk/blues singer please.

If you can, type out some of the lyrics.
And mention why/if it is so important to you.