On Wikipedia https://en.wikipedia.org/wiki/The_King%27s_Singers
Creation 1968, May 1st
City Cambridge, United Kingdom
Country United Kingdom
Links Allmusic

The King's Singers are a British a cappella vocal ensemble founded in 1968. They are named after King's College in Cambridge, England, where the group was formed by six choral scholars. In the United Kingdom, their popularity peaked in the 1970s and early 1980s. Thereafter they began to reach a wider international audience, appearing frequently on The Tonight Show Starring Johnny Carson in the U.S. In 1987, they were prominently featured as guests on the Emmy Award winning ABC-TV special Julie Andrews: The Sound of Christmas.

Today the ensemble travels worldwide for its performances, appearing in around 125 concerts each year, mostly in Europe, the U.S.and the Far East, having recently added the People's Republic of China to their list of touring territories. In recent years the group has had several UK appearances at the Royal Albert Hall Proms and concerts as part of the Three Choirs Festival and the City of London Festival. Wikipedia