The duo wrote hits for the Sweet, Suzi Quatro, Mud, New World, Arrows, Racey, Smokie, Tina Turner, Huey Lewis and the News, Exile and Toni Basil.

[3] Chinn was born in London to an affluent Jewish family that owned a string of service stations and car sales distributorships.

Chapman was already a professional musician and songwriter with the band Tangerine Peel, and the two quickly joined up with Mickie Most's RAK label.

[3] Chinn's and Chapman's songwriting style was so successful with British and worldwide audiences that Sweet had an uninterrupted string of million-selling hits in the next few years.

Chinn and Chapman stopped working with Sweet in 1975 but achieved equal success worldwide with Suzi Quatro, for whom they wrote many hits.

In 1982 "Mickey" by Toni Basil gave the two their second American number one,[3] and in the mid 1980s they had top ten hits with Tina Turner's "Better Be Good to Me",[5] and Huey Lewis's "Heart and Soul".