Sir Roderick David Stewart is a British rock and pop singer and songwriter. With his distinctive raspy singing voice, Stewart is among the best-selling music artists of all time, having sold more than 120 million records worldwide. He has had 10 number-one albums and 31 top-ten singles in the UK, six of which reached number one. Stewart has had 16 top-ten singles in the US, with four reaching number one on the Billboard Hot 100. He was knighted in the 2016 Birthday Honours for services to music and charity.

John William "Long John" Baldry was an English musician and actor. In the 1960s, he was one of the first British vocalists to sing the blues in clubs and shared the stage with many British musicians including the Rolling Stones and the Beatles. Before achieving stardom, Rod Stewart and Elton John were members of bands led by Baldry. He enjoyed pop success in 1967 when "Let the Heartaches Begin" reached No. 1 in the UK, and in Australia where his duet with Kathi McDonald "You've Lost That Lovin' Feelin'" reached No. 2 in 1980.