As the character / is reserved for other uses I have decided to replace it with something more friendly.
Where there are instances of multiple artists I reckon that for the sake of simplicity I will use ;space.
I am able to filter out tracks containing multiples of artists but don't know how to create a suitable Action.
Would like to be able to achieve
Artist Smith / Jones / McClumpher
Title 101 Nee Ha
Filename 101 (Smith; Jones; McClumpher) Nee Ha.mp3