The Sparks brothers: Ron and Russell Mael.
Probably best remembered as 'one hit wonders' for "This Town Ain't Big Enough For Both Of Us" in 1974. Most others who have one hit song promptly disappear and are rarely heard of again. But Sparks continued, albeit away from the limelight, and over the years have made over 20 albums and fortunately they are as eccentric/weird as ever in their musical exploration even writing an opera about Ingmar Bergman. And a song about lawnmowers.....?