Ernie Field's Orch., led by Ernest Lawrence Fields, was an American rhythm and blues band that gained prominence in the late 1950s and early 1960s. The band's music is characterized by its R&B style with a distinct blend of jazz influences. The band's most notable work is their 1959 rendition of the song "In the Mood," which topped the Billboard Hot 100 chart. This work not only marked their peak but also contributed significantly to the popularization of R&B music during this period.