Ditlev Trappo Saugmann Bjerregaard
Ditlev Trappo Saugmand Bjerregaard (1852 in Højbjerg, Denmark – 1916 in Kjellerup, Denmark) was a Danish businessman, traditional musician and a prolific composer of traditional dance music. He had a shop in Kjellerup where he sold musical instruments and toys, and where he also taught music to local children. He began composing in 1872 and published his first tune collection in 1878. With his band he toured local dance halls and parties, as his was the only major orchestra in the area between Silkeborg and Viborg. He composed around 900 tunes which he published in 76 tune collections that he printed, sold and distributed throughout Denmark. Most of his compositions are polkas, waltzes, galops, hopsas, scottisches, and mazurkas, arranged for 3 violins, flute, klarinet, 2 trumpets, tenorbas og doublebas. Among his most famous compositions are the hopsa "Drej skruen" and several others. In 2000 a remembrance plaque was placed at his home in Kjellerup, inaugurated by the deputy mayor.
- Bo Skjærbæk. 1999. "Kort biografi om D.T.S. Bjerregaard bl.a. ud fra Edvin Sevelsted: Fem gange Bjerregaard (Amtscentralen Oustruplund, ca. 1994) og oplysninger fra svigerdatteren Esther Bjerregaard" (from Saugmann Bjerregaards Fond, in Danish). 
- Bo Skjærbæk. Arangement history (from Saugmann Bjerregaards Fond, in Danish, last edited 2016)
- Dan Fog. 1984. Musikhandel og nodetryk i Danmark efter 1750, Volume 2 p. 166
- from Saugmann Bjerregaards Fond (in Danish)