ABBA is a Swedish pop group formed in Stockholm in the early 1970s, consisting of Agnetha Fältskog, Björn Ulvaeus, Benny Andersson and Anni-Frid Lyngstad. They are primarily associated with pop and pop-rock, with influences from disco and Europop, and became notable for polished production, catchy melodies, close vocal harmonies and layered arrangements. ABBA achieved international commercial success through radio-friendly singles, elaborate studio work and distinctive vocal interplay between the female and male leads. Active mainly from the early 1970s through the early 1980s, their music is characterized by strong hooks, concise song structures and an emphasis on melody and studio craft.