Barrett's health began to decline in the 1970s, which forced her to stop touring. She was replaced as leader by brothers
Percy Humphrey (trumpet) and
Willie Humphrey (clarinet). The lineup included Frank Demond (trombone), James Prevost (bass), James "Sing" Miller (piano),
Cie Frazier (drums),
Jim Robinson (trombone),
Narvin Kimball (banjo), and
Allan Jaffe (tuba). During the late 1960s and early 1970s, many of the touring members were hired by
Harold Dejan for his Olympia Brass Band. This band became not only a staple at Preservation Hall, but also influenced the Preservation Hall Jazz Band and future Preservation Hall musicians. Dejan's regular sidemen included
Andy Anderson (trumpet), Milton Batiste (trumpet), Kid Sheik Cola (trumpet), Paul Crawford (trombone) Gerald Joseph (trombone), Emanuel Paul (tenor saxophone), Andrew Jefferson (snare), John Smith, Henry "Booker T" Glass, Nowell "Papa" Glass. Cag Cagnolatti, Kid Thomas Valentine, Louis Nelson, Louis Cottrell, Jr., Cié Frazier, Emanuel Sayles, and Allan Jaffe on tuba were among those who played with the group. During the Olympia years, a young
Harry Connick Jr. performed with Barrett and the band at Preservation Hall. In 1977, Jaffe and Arthur Hall and his Afro-American Dance Ensemble released
Fat Tuesday and All That Jazz! A Mardi Gras Dance Musical. The world premiere of the dance musical was on February 19, 1977, and was followed by a tour in the United States. Dejan's Olympia Brass Band was featured in
Fat Tuesday and All That Jazz, in addition to the Arthur Hall Afro-American Dance Ensemble of Philadelphia, Pennsylvania. ==Later years==