The Sacred Cows.
The Sacred Cows, reputedly the "hottest musical group in the country," were actually a band of KAOS agents who were in league with The Groovy Guru.
In conjunction with the Groovy Guru's "electronic sound control," their music became hypnotizing, allowing the Guru to control anyone who heard it.
Portrayed by Ben Benay, Jerry Scheff, and John Greek. (All three were uncredited.) [Episode #75: "The Groovy Guru"]. For more see fakebands.com.
Get Smart - The Sacred Cows Kill, Kill, Kill
The Sacred Cows play.