Why Does All Jazz Sound The Same?

it would be too confusing if it sounded different, then we couldn't be sure it really is jazz...

Sorry guys.  Was making a joke!  I love jazz more than any other music.  I used to think it all sounded the same but once it clicked it became my favorite form of music.  
I feel like a troll for this.  Should have added sarcasm quotes or something!
Cheers

@snackeyp ,
You are Bad, bad man....😠
B

Yeah, I know.  I was mocking my coworker who always says that jazz all sounds the same.  I should have explained that but I wasn't very much awake yet when I had that thought.  
I told him he should try listening to the Grateful Dead (who I love BTW).  A lot of people say that all Dead music sounds the same.

@snackeyp What you are hearing is related to musical training. Classically trained musicians know where the right notes are and get them on the first try, while Jazz musicians go by trial and error. Jazz bass or guitar player "walks" all over the fretboard until he finds the right note. That makes all Jazz sound very alike, no matter who plays.