Avant-pop is a type of music that mixes together a bunch of different styles and sounds. It's kind of like making a big pot of soup but instead of vegetables and meat, you use music genres like rock, jazz, folk, and electronic.
The people who make avant-pop music like to experiment and try new things with their sounds. They might take a regular guitar or piano and make it sound weird or use a lot of different instruments at the same time.
The words they sing might not always make sense either - they might be silly or abstract or have a deeper meaning that's hard to understand.
People who like avant-pop music tend to be open-minded and curious about all kinds of art and music. They like the idea of taking something familiar and making it new and different.