There is a difference between hiring musicians for a wedding and for an event other than a wedding. Mostly it has to do with repertoire:  a lot of wedding music should be played by at least three musicians to make it sound decent. I have played at weddings with a duo, usually violin and viola, but personally – it is something I would have never done at my own wedding.  Imagine playing a piece such as the famous Pachelbel Canon with only two musicians! It sounds “empty” and unfinished. However, if you have a small business gathering and looking for a light background music without any flare – two musicians would be just fine.