"Just A-Sittin' and A-Rockin'" is a 1941 song

Song

In music, a song is a composition for voice or voices, performed by singing.A song may be accompanied by musical instruments, or it may be unaccompanied, as in the case of a cappella songs...

 composed by Duke Ellington

Duke Ellington

Edward Kennedy "Duke" Ellington was an American composer, pianist, and big band leader. Ellington wrote over 1,000 compositions...

 and Billy Strayhorn

Billy Strayhorn

William Thomas "Billy" Strayhorn was an American composer, pianist and arranger, best known for his successful collaboration with bandleader and composer Duke Ellington lasting nearly three decades. His compositions include "Chelsea Bridge", "Take the "A" Train" and "Lush Life".-Early...

, with lyrics written by Lee Gaines. It was released on his 1941 album ”Take the ‘A’ Train” (Vintage Jazz Classics).

Trivia

Early pressings of Victor 27587, released 12Sep41, show "Just a-Settin' and a-Rockin'"; the title was ordered changed to "Just a-Sittin' and a-Rockin'" on labels printed after "2/19" (19Feb42?); no copyright for this song was registered in the 1940s.

Notable recordings

• Ella Fitzgerald
  Ella Fitzgerald
  Ella Jane Fitzgerald , also known as the "First Lady of Song" and "Lady Ella," was an American jazz and song vocalist...
  
   - Ella Fitzgerald Sings the Duke Ellington Songbook
  Ella Fitzgerald Sings the Duke Ellington Songbook
  Ella Fitzgerald Sings the Duke Ellington Song book is a 1957 album by the American jazz singer Ella Fitzgerald, accompanied by the Duke Ellington orchestra, focusing on Ellington's songs....
  
  (1958)
• Stan Kenton
  Stan Kenton
  Stanley Newcomb "Stan" Kenton was a pianist, composer, and arranger who led a highly innovative, influential, and often controversial American jazz orchestra. In later years he was widely active as an educator....
  
   - On AFRS: 1944-45 {vocal by June Christy
  June Christy
  June Christy , born Shirley Luster, was an American singer, known for her work in the cool jazz genre and for her silky smooth vocals. Her success as a singer began with The Stan Kenton Orchestra. She pursued a solo career from 1954 and is best known for her debut album Something Cool...
  
  (2006)