Well said that Bloke. To my mind the best kind of sessions include singing and playing, such as the excellent session you mentioned. But newcomers should be aware of singarounds where tunes are not welcomed or singarounds that don't want any songs. To my mind the best sessions are when instrument players who sing get together with singers who play instruments. Not to say that there shouldn't be also room for unaccompanied singing, monologues, stories, jokes, a rapper side...

Perhaps we might see you tomorrow afternoon (2.30pm onwards) in the Black Boy, High Street, Hull?