One of the things I like to do when performing is to try to get the audience to sing along with me. So I found this article pretty interesting: http://www.wired.com/wiredscience/2012/07/sing-along-songs/
(If you are interested in that sort of thing, here's the actual paper the researchers wrote: http://www.doc.gold.ac.uk/~mas03dm/papers/PawleyMullensiefen_Singalong_2012.pdf)
Some of what they say seems pretty obvious to me, like the observation that people are more likely to sing along on high energy songs. Do any of you have suggestions on things that make a good sing along, or things that you do to encourage people to sing along? One thing I will do if the situation is appropriate is to outright tell the audience that I want them to sing along.