were one of the most successful vocal groups of the early rock and roll era. Their distinctive sound was a bridge between the pre-rock Tin Pan Alley tradition and the burgeoning new genre. The act went through several personnel changes, with the most successful incarnation comprising lead tenor Tony Williams, David Lynch, Paul Robi, Herb Reed, and Zola Taylor. The group had 40 charting singles on the Billboard Hot 100 chart between 1955 and 1967, including four no. 1 hits.