difference between rock and jazz music?

[M3h3m3]

English Grammar Tests, Elementary Level

ESL/EFL Test #152 "Dialogue Practice: Buying a Music CD (1)", question 2

Store Clerk: You can find that CD in the hard ......... music section.

(a) jazz
(b) classical
(c) children
(d) rock

English Grammar Tests, Elementary Level

ESL/EFL Test #152 "Dialogue Practice: Buying a Music CD (1)", answer 2

Store Clerk: You can find that CD in the hard rock music section.

Correct answer: (d) rock

Your answer was: incorrect
Store Clerk: You can find that CD in the hard jazz music section.
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Hi everyone,
Can someone please explain the difference between rock and jazz.
I don't have any idea of western music.
thanks

M3h3m3,Manish Kumar Yadav

[Linda]

Hello,
I'm not a musician but this is my opinion about the differences between rock and jazz.
Jazz: is complex and there are a lot of instrumental parts to a jazz song. Instruments such as saxophones are used and the whole genre is quite free in form. Harry Connick Jr. is a well-known jazz musician.
Rock: encompasses a lot of different rock varieties such as soft rock, hard rock, heavy metal, goth music and classic rock. This genre uses instruments like electric guitars. For example, Nirvana was a rock band.
Do any of the other teachers have anything they would like to add to these brief descriptions?
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[Puppet]

The point here that we just can't say "hard jazz", though. Sounds weird.

[M3h3m3]

Thanks for your help