The Modern Jazz Quartet (MJQ) was an influential American jazz group formed in 1952. Known for their unique blend of classical music and jazz, the quartet consisted of pianist John Lewis, vibraphonist Milt Jackson, bassist Percy Heath, and drummer Connie Kay. Their sophisticated style and emphasis on composition set them apart from other jazz ensembles of the time. The MJQ gained popularity for their innovative performances and recordings, which often featured intricate arrangements and a focus on melody. They played a significant role in the development of cool jazz and were known for their elegant stage presence. The quartet remained active for several decades, leaving a lasting legacy in the world of jazz.