Louis Armstrong and his Hot Seven was a jazz studio group organized to make a series of recordings for Okeh Records in Chicago, Illinois, in May 1927. Some of the personnel also recorded with Louis Armstrong and his Hot Five, including Johnny Dodds (clarinet), Lil Armstrong (piano), and Johnny St. Cyr (banjo and guitar). These musicians were augmented by Johnny Dodds's brother, Baby Dodds (drums), Pete Briggs (tuba), and John Thomas (trombone, replacing Armstrong's usual trombonist Kid Ory, then touring with King Oliver). Briggs and Thomas were at the time working with Armstrong's performing group, the Sunset Stompers. 　　In five sessions between May 7 and May 14, 1927, the group recorded at least 12 sides, including "Willie the Weeper," "Wild Man Blues", "Twelfth Street Rag" and "Potato Head Blues" (celebrated for Louis Armstrong's stop-time solo and triumphant ride-out final chorus). 　　In these records, Armstrong continued and further developed his mastery of the jazz solo, almost completely dominating some of the numbers and further breaking down the New Orleans jazz collective improvising style into a vehicle for the soloist. 　　The Hot Seven song "Melancholy Blues" is included on the Voyager Golden Record, attached to the Voyager spacecraft.