party song
/ˌpɑːti ˈsɒŋ/noun
1A song sung by, or associated with, a particular political group or faction.
2A song sung at a party; a piece of music played at a party, usually for people to dance to.
Origin
Early 18th century; earliest use found in James Bramston (?1694–1743), poet and Church of England clergyman. From party + song.