I use Jazz, Buble and a lot of instrumental music for the seating time during the ceremony but I take a different approach to dinner time at the reception. I try and get a good age profile on the attendees and their prefrences during the planning with the bride & groom and their parents.
I then pick some great hits from those eras that I won't be playing during dance time or are not exactly dance songs, all up tempo. That is what I start an automix playlist with. I then go out and visit the tables and people I think are showing the most energy, I notice their ages and take some additional request from those tables. I then start shuffling in those songs and back out to the audience. I do spend a lot of time talking to people during the nonscripted part of the reception.
It allows me to build energy in the audience and have a read on how to adjust the dance sets for those that I see are there to dance.
Recently I played some oldies, light rock/pop from the 60's and 70's (Sugar Sugar, Chevy Van, Me and You and Dog Named Boo, etc) and you would be surprised at the number of people who came up and asked for more of the songs like that, and stated they had heard more than enough Kenny G, Buble and like artist at weddings, they said bring on the classics.