The term 'Chiquitita Singing Group' is referring to the Swedish pop group ABBA, which was formed in 1972 and is best known for their hit songs such as 'Dancing Queen' and 'Mamma Mia'. The group consisted of four members: Agnetha Fältskog, Björn Ulvaeus, Benny Andersson, and Anni-Frid Lyngstad. They were active until 1982 and have since become one of the most successful and influential musical groups of all time.