Not What You Hear

You hear my sound; But that’s not me

In fact, we look quite differently

I can have one; it always has two; I can have three

It can be anywhere, but I like sitting in a tree

It comes in many different forms

But I usually come in one

I have an assortment of colours

But eat me & I’m done

It can represent a bond

I can be used to jam

Can you figure out

What it is & what I am?

Check Braingle.com for the answer.