Bert Olav Holmquistwas a Swedish trombonist who was active in the European music scene since the 1960s. Holmquist was born in Skellefteå. A completely self-taught musician, he began his career in a Swedish armed forces band (I20). He first took up the tuba, switched to valve trombone, and then to slide trombone. Starting as a freelance musician, he managed to land a job with the Swedish Radio big band in 1963 but continued to freelance throughout the 1960s. During this period, he often worked with Björn Ulvaeus and Benny Andersson, who were later members of ABBA.
He also worked regularly with American musician Quincy Jones