favor us with a song

Favor us with a song is the cliche used when you want to request a song to be played for a group. By saving favor in regards to a song being played, the request is asking for a treat or a reward. Favor us with a song is most commonly used in a group of people where playing a song isnt expected, therefore someone who is musically gifted playing a song on the piano or other instrument, or singing a song, is a treat.