Roger Whittaker is a Kenyan-British singer-songwriter and musician, who was born in Nairobi to English parents. His music is an eclectic mix of folk music and popular songs in addition to radio airplay hits. He is best known for his baritone singing voice and trademark whistling ability as well as his guitar skills.
Björn Kristian Ulvaeus is a Swedish singer-songwriter, producer, a member of the Swedish musical group ABBA, and co-composer of the musicals Chess, Kristina från Duvemåla, and Mamma Mia! He co-produced the films Mamma Mia! and Mamma Mia! Here We Go Again with fellow ABBA member and close friend Benny Andersson.
Mason Douglas Williams is an American classical guitarist, composer, singer, writer, comedian, and poet, best known for his 1968 instrumental 'Classical Gas' and for his work as a comedy writer on The Smothers Brothers Comedy Hour, The Glen Campbell Goodtime Hour, and Saturday Night Live.