The Soul Stirrers were a pioneering gospel group that greatly impacted the genre with their innovative vocal harmonies and emotive performances. Formed in the 1920s, they introduced the "lead-switching" technique, where different members alternate leading the song, significantly influencing the development of soul, doo-wop, and Motown sound. The group's most notable member, Sam Cooke, joined in 1950 and brought an added pop sensibility to their spiritual music. Their influential works include "By and By" and "Touch the Hem of His Garment."