Worst Combinations of Music Genres

The Top Ten
K-pop and Rap

Two genres that are going downhill to the ground for sure

Keith Ape is great.

Jazz and Pop

Although I like jazz, the two together are worse than pop on its own. The rhythm, drumming and layout mostly comes from pop, while some girl meows in a hoarse voice, and a man is playing random notes on a saxophone, and someone is rolling his elbow on a piano. Not to mention that both pop and jazz lyrics are already weak on their own.

Country and Rap

It just makes me laugh

Emo and Rap
Reggae and Country

A genre based on American and one based on Jamaican folk music together? You should just add some sitar, bagpie, pan flute, steel drums and balalaika to complete the picture.

R&B and Reggaeton

Perfect music for a cheesy Brasilian soap opera.

Progressive Rock and Hip Hop

Prog - Musically complex with many themes surrounding its structure
Hi Hop - Musically repetitive with common themes surrounding its structure
Yeah, try combining those two. Doesn't work, does it?

Latin and Disco

I agree that disco goes with rock - "I Was Made For Lovin' You" by Kiss is basically a disco song made hard rock style.
I would add that surprisingly, disco also goes with metal, judging by some metal covers of disco songs.

Disco goes surprisingly well with some genres: Blue Öyster Cult's self-titled song is a great example of disco and rock together.

Alternative Rock and Metal

Some bands like System of A Down and Faith No More are good though

It usually remains alternative rock.

Jazz and Metal

Jazz has 2 layers: popular jazz and instrumental (more technical) jazz. Popular jazz doesn't go with metal. But elements from instrumental (technical) jazz are used in metal, mostly in progressive metal (esp. technical death metal and progressive death metal). I think it's an interesting experiment but some results are better than others. Some metal bands just incorporated jazz better and I don't mind this combination when it's done good.
I made a list about it - Top 10 Metal Songs with Jazz Influences

Both genres are great on their own, but the culture beyond them is so opposite. I wonder if a metal fan can recommend me a great example of this combination.

Edit: I didn't know Cynic and Watchtower when I made this comment

Cynic, The Aristocrats, and Atheist are very disappointed in you.

Jazz and Metal should not be together.

The Contenders
Christian and Pop

By Christian, I mean religious songs sung in the church. Nowadays it is a fashion to sing pop songs about God in the church, but why?

It's done to encourage youngsters to attend... guitars and happy clappys. Pop/rock songs do not belong in church.

Operetta and Pop

Together I call it "great-grandma music".

Disco and Metal

There’s a metal cover of “Havana” with disco elements.

Country and Pop
Rap and Nu-Metal

This is literally Limp Bizkit

Grindcore and R&B

HOW would this even work?

Rap and Rock

Some rock artists with rap on them are good, such as Rage Against the Machine, Red Hot Chilli Peppers, Beastie Boys, and Run-DMC.

Post Hardcore and Pop
Ragtime and Grunge

I put it on last place because I think it does not exist, but imagine it did...

How would it work?

Progressive House and Hip Hop/Rap
Grindcore and Jazz
Drum N Bass and Downtempo
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