Although each part of your song is tremendously important to the final outcome, working with rhythm and percussion is debatably the most important part of your song. If your drums, kicks, snares, hi hats, and other percussion are weak, you song won't stand the test of time and won't sound very good to your listeners. Rhythm and drum samples can sound very different from genre to genre, so you want to pick these properly. That being said, you can also experiment with a fusion of sounds and mix genres to create your own sound.