Born in England, migrated to Australia and then back to England, the Brothers Gibbs, Barry, Robin and Maurice, brought an unforgettable sound to the 60's with "soft rock" ballads sung in vocal harmony, with Barry's voice already standing out. They shocked society with the "surreal, haunting and macabre composition, New York Mining Disaster 1941 (1967), that made the Top 20 on both sides of the Atlantic." (src.: wikipedia).
"And the lights, all went down, in Messachussetts..." will be forever imprinted into our memories (those of us who lived those times), as a song that marked an era.
Their last big hit of the 60's era, "How Can You Mend a Broken Heart?" hit the pop charts in 1971 - they would hardly be heard again until the Disco era boomed in 1975, and Barry's lead falsetto voice became their trademark.
But Disco is another category.
I Started A Joke
I Just Gotta Get A Message To You
It's Only Words