jam session

noun
1.
a meeting of a group of musicians, especially jazz musicians, to play for their own enjoyment.
2.
an impromptu jazz performance or special performance by jazz musicians who do not regularly play together.
Also called jam.


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

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Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To jam session
Collins
World English Dictionary
jam session
 
n
slang an unrehearsed or improvised jazz or rock performance
 
[C20: probably from jam1]

Collins English Dictionary - Complete & Unabridged 10th Edition
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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
  session.
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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