Stig Erik Leopold "Stikkan" Anderson was a Swedish music manager, lyricist and music publisher. He was the co-founder of Polar Music, and is best known for managing the Swedish pop band ABBA.

Björn Kristian Ulvaeus is a Swedish musician, singer, songwriter, and producer best known as a member of the musical group ABBA. He is also the co-composer of the musicals Chess, Kristina från Duvemåla, and Mamma Mia! He co-produced the films Mamma Mia! and Mamma Mia! Here We Go Again with fellow ABBA member and close friend Benny Andersson. He is the oldest member of the group.