Caballo Vapor, a progressive jazz rock group from Buenos Aires led by Johnny Allon. It was in late 1972 when this Buenos Aires-based band began its journey, merging the Torres brothers of the group Mandrágora and Johnny Allon. In 1975, they released the album we’re discussing on the Music Hall label, but with the sides reversed. Rafa Amilburu explains all this in great detail in a full-color insert accompanying the album.