Tromboner

I played a storm last night
I played with all my might
Where were you, where were you?

To great applause I took a bow,
Then I stood and searched the crowd
Where were you, where were you?

I suppose, not everyone cares for
Slide trombones, but it's all that I'm good for.

Last night I stole the show,
But all the time this thought to and fro
Where were you, where were you?