The Heat Is On is the thirteenth studio album by American soul and funk group The Isley Brothers, released June 7, 1975, on T-Neck Records and Epic Records. Written and produced entirely by the group, the album was recorded in 1975 at Kendun Recorders in Burbank, California. The Heat Is On features musical elements of rock, and is divided between uptempo funk songs and soul ballads. No. 1 on the Billboard 200 for 1 week, from the issue of September 13, 1975. Wiki link