Ensemble of four string players.

Ensemble of piano and strings.

Four singers harmonizing a cappella.

a jazz combo established in 1952 that played music influenced by classical, cool jazz, blues and bebop.

Anscombe's quartet comprises four datasets that have nearly identical simple descriptive statistics, yet have very different distributions and appear very different when graphed.

"Million Dollar Quartet" is a recording of an impromptu jam session involving Elvis Presley, Jerry Lee Lewis, Carl Perkins, and Johnny Cash made on December 4, 1956, at the Sun Record Studios in Memphis, Tennessee.

is a Japanese manga series written and illustrated by Suzuhito Yasuda.

The Mortal Engines Quartet (Hungry City Chronicles in the United States), also known as the Predator Cities Quartet, is a series of epic young adult science fiction novels by the English novelist and illustrator Philip Reeve.