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"Changes" is a song originally by Black Sabbath. It was released on the album Sabbath Bloody Sabbath in 1973. The song was written by Tony Iommi, Geezer Butler, and Ozzy Osbourne. It is a hard rock song with a bluesy feel. The lyrics are about change and how it is a part of life. The song is considered one of Black Sabbath's most popular songs.