Born in Dumbarton and raised in Clydebank and Cumbernauld, Scotland, McCulloch began to play the guitar at the age of 11 and at that age, he made his performance debut as the guitarist for The Jaygars, which was later known as One in a Million. One in a Million performed live in support of The Who during The Who's tour of Scotland in 1967. That year, One In A Million released their "Fredereek Hernando / No Smokes" single. Double Sight, a CD compilation of these and other songs written and recorded by the band, was released in 2009