When you play brass instruments, the way you shape your mouth, known as embouchure, is really important. Each brass instrument needs a different embouchure. Here’s what I’ve learned from my experience:

1. Trumpet: You need to keep your lips tight. Try to make a small opening with your lips. Imagine you are smirking, with the corners of your mouth slightly up. This helps you hit those high notes!

2. Trombone: Staying relaxed is important here. Your embouchure should be a little looser than with the trumpet, but you still need some firmness to control the sound. I've noticed that where I put the slide can change how tense my lips feel, so I adjust as needed.

3. French Horn: This one can be tricky! The mouthpiece is deeper, so you need to make your lips rounder. I focus on keeping the sides of my lips firm while letting the middle be relaxed.

4. Tuba: Relaxation and good airflow are key. The embouchure here is wider, almost like you're blowing into a big surface. Using a larger area of your lips helps create a richer sound.

Each instrument needs its own style, but finding the right embouchure can really improve your sound and control!