Doc Bagby was an American R&B and jazz organist active during the mid-20th century, particularly known for his contributions to the Hammond organ sound in rhythm and blues music. He was a significant figure in the transition from big band to smaller R&B combos, bridging the gap between these two styles. Bagby's notable works include singles such as "Dumplin's" and "Hayride", which showcased his unique blend of jazz and R&B. His style and pioneering use of the organ have left a lasting impact on the genre.