I've finally decided to ditch playlisting by all individual artists, as it's getting too much of a hassle to maintain every time I upload, with 8,000 tracks already there. However, when I started doing this delete in emplode, the playlists that I have copied from this Artists A-Z hierarchy into other playlist hierarchies (Favourite Artists, Electronic->Artists, Rock->Artists etc) all get marked for deletion too. Is there any way around this?