"Find like-minded, bright, hard-working people that you think share a core set of values and a core vision of what you are trying to do and where you're trying to go. That makes it substantially easier to realize whatever that vision may be."
-Kevin Browning, Creative and Business Development Manager for Umprhrey's McGee
If you are a musician looking to form a chamber ensemble, don't simply go for the best players. Find the best players who also fit the description above and great things will happen.
Chamber groups, whether they be brass quintets, string quartets, jazz trios, barbershop quartets, or rock bands, rarely fail to stick around because the music making isn't good enough. It is almost always a result of visions not lining up or of people not working equally towards attaining that vision.
This two sentence quote can save you a whole lot of time and money if you start there and then worry about the rest of it.