William Bradford Champlin is an American singer, keyboardist, guitarist and songwriter. He formed the band Sons of Champlin in 1965, which still performs today, and was a member of the rock band Chicago from 1981 to 2009. He performed lead vocals on three of Chicago's biggest hits of the 1980s, 1984's "Hard Habit to Break" and 1988's "Look Away" and "I Don't Wanna Live Without Your Love". During live shows, he sang the lower, baritone, vocal parts originally performed by founding guitarist Terry Kath, who had died in 1978. He has won multiple Grammy Awards for songwriting.

Jay Joseph Graydon is an American songwriter, recording artist, guitarist, singer, keyboardist, producer, arranger, and recording engineer. He is the winner of two Grammy Awards with twelve Grammy nominations, among them the title "Producer of the Year" and "Best Engineered Recording". He has mastered many different music styles and genres, and his recordings have been featured on record, film, television and the stage.