When looking for entertainment for a wedding reception you may want to consider adding on a traveling musician. It could be as simple as a violin player who will go from table to table to set the mood as the guests are arriving. This will give you that special person to perform as you want.
To truly set yourself apart at your next big party why not hire a singer to go and perform throughout the party. They can have their own background music or they may just sing without any accompaniment. It is whatever you decide to bring in to help liven up the party and make it more fun.