Sven-Olof Walldoff

Sven-Olof Walldoff (2 May 1929 – 7 June 2011) was a Swedish record producer, composer and orchestra conductor who is best known for conducting the orchestra for ABBA's song "Waterloo" for the Eurovision Song Contest 1974, wearing a Napoleon costume.
Walldoff also collaborated on ABBA's first album "Ring Ring".