Sun and Steel is the sixth and final album released by Iron Butterfly in 1975. It explores a wider variety of styles than any other Iron Butterfly album yet always remains within the contemporary conventions of hard rock aside from a foray into progressive rock on I'm Right I'm Wrong. 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?
Album