I'd say if you don't know the original artist or origin of the piece, you shouldn't use the material for a remix, remake, or cover of any variety. I think you really have to be able to give credit. Originality is crucial.. and, honestly I just kinda believe this especially, just for me, personally, that's what I think.
Of course what I heard here sounded fine, in fact it was pretty nice. So definitely keep working, but maybe on stuff all your very own. I think that would be really special ;)
Please contact me if you would like to use this in a project. We can discuss the details.