The majority of my work is for baby boomers that are eating and/or drinking and chatting while I play.  
Last night I did a gig that I split with a band.  The band was very good and did some stuff that was very impressive, but got hardly any reaction from the crowd.  As I started, “When the Moon Hits Your Eye …”  I can see people glancing my way and/or mouthing the lyrics.  “Gigolo” and to a lesser degree, “Volare” get the same reaction.
I’d like to know what tunes others, playing in a situation where the performer is not necessarily the focal point, elicit a noticeable (affirmative) rise from your listeners?  
Ciao,
Jerry