there is a lot to be said about unaccompanied singing, I find it a refreshing change to go into a bar/parlour where a "sing-a-round" is in session. Most memorable from a visit to a traditional Irish pub where someone starts and each person then does a "turn" as the flow goes around the room.
here in Stockport, England we have a folk club that does just that. every Monday is a sing-a-round with each person doing a song/story/monologue in turn. The session is led by the host who interrupts the round every so ften with a song accompanied to his/her musical instrument. But by and large it is great entertainment