Are you sure? The other bands really are all similar to Black Sabbath.  There are lots of famous groups who are popular in the metal genre, like System of a Down, Dream Theater, and My Dying Bride.  All of these artists also have a lot of music about sadness, violence, and alcohol, as well as references to God and the devil.
assitant
Metallica
assistant
Could you give me a couple recommendations on bands similar to Black Sabbath?
user
Sure, we have some genres that cover similar music.  Have you heard of stoner rock, metal, or sludge metal?
assistant
I have heard of metal but not stoner rock or sludge metal.
user
Well they all have a lot in common, they are usually heavy and slow-paced and make loud noises.  Do you want to listen to any songs? I can play you some recommendations.
assistant
I would really just like some band recommendations that are similar to Black Sabbath.
user
Okay, I can’t recommend specific songs, but the three types of metal are similar because they all feature the same kind of slow guitar riffs, loud drums, and distorted vocals. They also usually have many of the same lyrics, like references to drinking and drugs, or violence.  I recommend you check out Ozzy Osbourne’s music, he is an early innovator in the genre.  Another big-name metal artist is Metallica.  Also I’ve heard that there are several hundred more metal bands who all have similar music, would you like me to list a few?
assistant
Could you just list one band that is closest to Black Sabbath?
user