ABBA is a Swedish pop group, formed in Stockholm in 1972 by Agnetha Fältskog (vocals), Björn Ulvaeus (guitar and vocals), Benny Andersson (piano and vocals) and Anni-Frid Lyngstad (vocals). ABBA is one of the most successful bands in the world with more than 200 million albums sold (and a total of over 370 million singles sold). The success started when ABBA won the Eurovision Song Contest in 1974 with this song 'Waterloo.' The name ABBA is an acronym, consisting of the first letters of the first names of the members. On the record sleeves the first B is often in mirror image. This arrangement by Fritz Neuböck includes parts for electric bass guitar, piano, and 4 vocals.