I think it is a bit unfair, and not a little bit provincial, to cite as "one hit wonders" performers who, for a time, dominated the singles charts internationally, yet nevertheless only managed one hit single in the US. On this account, T-Rex was no more a one-hit wonder than were The Beatles. As for The Hollies, they were a hit machine almost everywhere. "Long Cool Woman" was not their only success in the US. In the 1967 US charts, both "Carousel" and "Carrie Anne" were among the 100 top selling singles of the year. "He Ain't Heavy, He's My Brother" was similarly among the top 100 US singles of 1970.