Leave space.

This gives the other players the most options for adding their parts.

Listen.  

A most important and undervalued skill in music as in life, hearing what is going on and reacting to it directly.

Keep it simple.  

This works on a similar level to leaving space, a simple part is best foundation for other ideas.  

Be playful.  

Don’t forget why they call it playing, we do it for the same reason all baby animals love to play.

Don’t look for the spotlight.  

The best ensemble playing is done by generous players who listen to each other and add only parts that make the ensemble sound better.