Please answer the following question: Square Window is a promotional 3 CD EP by Squarepusher distributed only with pre-orders of Ultravisitor from Warp Records' online store. The five songs on this EP were also included on the second disc of the Japanese version of Ultravisitor. Given a list of categories: company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, what category does the paragraph belong to?
Answer:
Album