B.T. is from the album Scorpio, with 4 tracks  composed by Arthur Jones, recorded in Paris, August 1969, released in 1971 on BYG Records.

Arthur Jones had one of the warmer and more romantic styles in “energy music,” making this, his debut as a leader, a highly enjoyable set. While the late-’60s avant-garde jazz scene is typically associated with heated and furious solo flights, Jones managed to fuse his love of older bop and blues players with the prevalent tendencies of the day. In this way, Jones was as adept at caressing a ballad as he was at shredding apart a fast one. [source]

Arthur Jones (1940 – 1998) was an American Free Jazz alto saxophonist known for his highly energetic but warm tones. Jones first played for several years in a Rock and Roll band. After discovering music by Ornette Coleman and Eric Dolphy, he started appearing on the New York scene, playing in Frank Wright’s group where he took part in the recording of the Your Prayer (1967) album. He then also worked with Jacques Coursil. In 1968 he was a member of Sunny Murray´s Acoustical Swing Unit, with which he went to Paris in 1969 and where he recorded two albums of Africanasia as leader with most of the musicians from the Art Ensemble of Chicago. He also made numerous other recordings for BYG Actuel, with Coursil, Archie Shepp, Sunny Murray or Burton Greene. [source]

Claude Delcloo – Drums
Arthur Jones – Alto Sax
Beb Guerin – Bass