jam session

a meeting of a group of musicians, especially jazz musicians, to play for their own enjoyment.
an impromptu jazz performance or special performance by jazz musicians who do not regularly play together.
Also called jam.

1930–35; perhaps jam1, or by shortening of jamboree

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World English Dictionary
jam session
slang an unrehearsed or improvised jazz or rock performance
[C20: probably from jam1]

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Example sentences
In the informal situation, you can find yourself in a jam session, where
  anything can happen.
Tonight travelers and locals alike gather around platters of barbecued chicken
  for a jam session.
If you're lucky, you might see a big-name professional artist pop in for a jam
Second, each musician is directly connected with the other musicians in a jam
  session, instead of being routed through a server.
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