After Hours is a slow blues piano composition written by Avery Parrish, first recorded in 1940 with the Erskine Hawkins Orchestra on Bluebird Records. Parrish, a Birmingham, Alabama native and pianist with the Hawkins band (which grew out of the 'Bama State Collegians), created a piece that defined a new strain of urban slow blues, distinguished from the rawer boogie woogie style that preceded it. The composition features a moody, introspective atmosphere with a virtuosic piano part and a distinctive low-register ending in the final four bars, qualities that suited the compressed sound of 78 rpm recordings and gave the piece an intimate, after-hours character. The tune became enormously influential, earning the informal title "The Black National Anthem" for a period and launching an urban slow blues idiom that fed directly into 1950s Chicago blues, rhythm and blues, and early rock and roll. It remains a litmus test for pianists in club settings, a piece that reveals command of touch, phrasing, and blues feeling. Notable recordings include Art Simmons's treatment on Boogie Woogie Piano Stylings from 1959, versions by Phineas Newborn and Hazel Scott, and the performance captured on the 1957 album Sonny Side Up featuring Dizzy Gillespie with Ray Bryant on piano, alongside tenor saxophonists Sonny Rollins and Sonny Stitt. Parrish's career was tragically cut short by a 1943 injury that left him partially paralyzed, and he died in 1959, but After Hours endures as his signature contribution to American music.