When Les McKeown became lead singer of the Bay City Rollers just days after his 18th birthday, the addition of his voice and personality transformed the band from potential one hit wonders into an international super group, notching up nine UK top ten hits including two number ones. Their first two albums, ‘Rollin’’ and ‘Once Upon A Star’, stayed on the album charts for a total of 99 weeks and ‘Bye Bye Baby’, the Rollers’ first No. 1 single, was the UK's biggest selling single of 1975. Between 1974 and 1978 the Bay City Rollers achieved no 1s in pop charts across the world with such songs as “Saturday Night” and “I Only Want To Be With You”. Mass hysteria seemed to follow their every move; the screams of a generation of young girls could be heard across the nation and in every corner of the globe – the world had truly turned tartan!