Please ask the Artists what they are looking for in terms of Remix.
I mean wheather they are looking for a bettered version of the same song with almost the same content but mixed from a different perspective and with a different creative approach, they are looking for a Remix with a complete change of almost everything or a remix with the song in a different style maybe. Maybe there are combinations possible and most probably absolute No Gos for the Artist.
It would also be incredibly helpful if the artist writes a description of the ideas behind the track so that we can together make shure that certain aspects stay in the tune and don´t get lost. As well as maybe images or artwork that they may wish us to incorporate into the new version as a sort of creative guide line for the creative process.