def in_collection(user=nil,start=nil,count=nil,sort=nil,query=nil)
      api.getArtistsInCollection user,start,count,sort,query
    end
def in_collection(user=nil,start=nil,count=nil,sort=nil,query=nil)
      api.getArtistsInCollection user,start,count,sort,query
    end
Get all of the artist in a user's collection.