premise: Nativity in Black is the name of two Black Sabbath tribute albums that came out in the 1990s and 2000s. The albums were recorded with various heavy metal bands paying tribute to Black Sabbath for their influence on the heavy metal genre of rock music.
hypothesis: Nativity in Black isn't a Black Sabbath album.  
reason: Nativity in Black isn't a Black Sabbath album. They aren't on it. Other bands are on it playing Black Sabbath songs. It's a tribute albume. 