Description This copy of Hep Stars 1964 - 1969 has been signed by ABBA 's Benny Andersson. The Hep Stars was a Swedish rock group, formed in 1963 in Stockholm. During 1965-66 the band was the most successful of contemporary 1960s Swedish pop groups performing in the English language. Outside The Nordic Countries the band is best known as a launching point for the keyboard player and composer Benny Andersson, who went on to enjoy worldwide success with ABBA.