i am working on my music for my all state audition and i have to play a technical and lyrical piece. i got all the notes and rythems down perfect so now i'm working on musictionship. my band director has heard me play it and he says it sound great but a nice vibrato would make the lyrical piece really pop but he dosn't have time to help me with it right now. i've developed alot of techniques but i need some help on developing a good vibrato. dose anyone know somthing that would help me?

That's a tough one to deal with over the internet. How much time do you have to prepare? A nice vibrato is not something that comes overnight. First of all, there are several different types of vibrato. The two main types used by trombonists are :
1.. slide vibrato (self explanatory) - more often used in jazz and big band settings, but can be heard elsewhere as well.
2... jaw vibrato.. created by a subtle rapid motion of the jaw
Personally, for a classical solo, I would use the jaw vibrato, but I caution you that it takes a while to learn to do it and to get it to sound nice, smooth, and even.
At the risk of sounding like a broken record here..
This topic would be best explored with the help of a private teacher!

I use jaw vibrato myself. What I was told with it was slow music=slow vibrato and so on. But practice the vibrato at the tempo the song is and/or at t=60 and do quarter notes, 8th notes, triplets, 16th notes. Thats the way I learned it. But a private teacher would help so much with this

try thinking about massaging the your air flow. I try to think of my airflow when playing normally as a train. Think of vibrato as a train but the hulk made an indentation to make a train look like soundwaves. Remember all of the air is still there. Airflow shouldn't change.

try thinking about massaging the your air flow. I try to think of my airflow when playing normally as a train. Think of vibrato as a train but the hulk made an indentation to make a train look like soundwaves. Remember all of the air is still there. Airflow shouldn't change.

jaw vibrato sounds better. To me, on a solo, jaw vibrato is a must.

It really depends on the genre of music being played. It's a stylistic choice.