In his book "Pop Memories 1890–1954", music archivist and statistician Joel Whitburn assessed a variety of sources such as "Talking Machine World" 's lists of top-selling recordings, and "Billboard" 's sheet music and vaudeville charts, to estimate the most successful recordings of the period. He concluded that the Peerless Quartet had 102 "top ten" hits in all between 1904 and 1926, and in the decade 1910–1919 had more successful recordings than any other musician or group. Although Whitburn's methods of assessment have been criticized, this broadly confirms statements that the group were the most popular of their era.