GUEST musician
Well said - there is real distinction between singaround and session - perhaps what distinguishes them is the element of 'performance'. In my experience, singaround is more about performance, with lots of 'shhushing' going on and applause given (and expected). A real session is more inclusive, yet without the element of performance (although the occasional rogue 'show-off' can pop up in a session!). The music is played primarily for those playing it, and applause is not common, certainly among the musicians.