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. They were recognized for their sophisticated arrangements and smooth, melodic style. The MJQ gained popularity for their innovative performances and recordings, contributing significantly to the jazz genre. They often incorporated elements of cool jazz and third stream, a fusion of jazz and classical music. The quartet remained active for several decades, leaving a lasting legacy in the world of jazz.