The 1974 winner, "Waterloo" by ABBA, is considered the most popular Melodifestivalen and Eurovision song of all time, and earned Sweden their first Eurovision win. "Waterloo" was voted the most popular Eurovision song at a fiftieth anniversary concert in late 2005. ABBA was not new to performing at the festival. Anni-Frid Lyngstad performed solo in 1969, and the group participated in the 1973 competition as "Agnetha, Anni-Frid, Björn & Benny" singing "Ring Ring". Björn Ulvaeus and Benny Andersson wrote four Melodifestivalen songs in total, three of which were co-written by ABBA's manager, Stikkan Andersson. After SR staged the 1975 Eurovision Song Contest in Stockholm, it was argued by left-wing groups that Sweden could not afford to win and host the Contest again. This led to mass demonstrations against commercial music and the organisation of an anti-commercial "Alternativfestivalen". Sweden therefore could not send a song to Eurovision 1976, the third and most recent time the country abstained from participating.