[pkscout]

Edit - Yes to comes pre-loaded, I tested it with the spotify top 100 and it really struggled when there was more then one name in the artist. For instance Dark House by Katy Pery, Juicy J doesn't pull any images. Even if it just pulled the first artist named would normally identify the main artist Also my normal screen saver kicked in, is there a way to tell it not to start if music is playing? I'm having to use the waveform visualization to get around this.

Unfortunately there is no way to tell the difference between Katy Perry, Juicy J as two artists and Earth, Wind, & Fire as one. AS supports three ways of identifying multiple artists:

1. When scrapped, XBMC will separate artists based on the separation string (by default that is ' / '). AS asks XBMC for the list of artists associated with the song. (this one probably doesn't apply in your case since Spotify music obviously isn't scrapped into the library).
   
2. AS will also look at the artist string and try and parse multiple artists. AS looks for the standard XBMC separator (' / ' <- that's a space, a slash, and a space) as well as 'feat.' and 'ft.' (for featured).
   
3. AS also looks in the song title for 'feat.' and 'ft.' (this is the iTunes/Amazon style for featured artists)
   

If SpotiMC could deliver one of those, than AS would provide a slideshow combining all the artists. Without that, there is no artist named Katy Perry, Juciy J, so no artwork is found. If you have a bunch of songs from a specific combination of artists, you could create a local folder with that combined name and then put images from both artists in there.

Also it would be nice if the artist slideshow had the same option as the picture slideshow ie pan and zoom

That's a skin decision. AS doesn't actually show the slideshow, it just tells the skin where to find the images.