The Kay Gees were an American funk and disco group active from the mid-1970s to the early 1980s. They were the spin-off of Kool & the Gang, featuring Kevin Bell, brother of Kool & the Gang's Ronald Bell. Known for their energetic and danceable sound, the Kay Gees were instrumental in the evolution of funk into disco, with hits such as "Hustle Wit Every Muscle". Their fusion of R&B, soul, and funk elements helped shape the disco era, making them an important part of music history.