After one semester at the Musikhochschule München he changed to the Konservatorium Würzburg, where he studied piano under Professor Heinz Knettel, violin and viola under Willy Schaller and conducting as well as composing under privy councillor Hermann Zilcher.
Wilhelm Keilmann passed the Staatsexamen with distinction in all four subjects on July 13, 1937, and his commissioned work "Hymne an die Schönheit" after Christian Morgenstern for soprano, choir and orchestra (op.
After a year as Kapellmeister at the Mainz City Theatre he married the violinist Hertha Bulle (10 August 1916) and moved with her in 1939 at the outbreak of war as a music teacher couple to a rural boarding school in Schondorf am Ammersee.
In 1943 Keilmann gave concerts in German military hospitals with recitals of songs and duets with Tilla Briem (soprano) and Fred Drissen (bass baritone).
As an accomplished piano accompanist, he developed the subject "Prima-Vista", a methodical and stimulating instruction for playing the sheet music, which was translated into English and Japanese by Edition Peters under no.
His versatility as a pianist, conductor and composer has been exceptionally appreciated by world-famous personalities such as Elly Ney, Ludwig Hoelscher, Wilhelm Stross, Kieth Engen, Detlef Kraus, Fred Drissen, Oscar C. Yatco, Josef Märkl, Rudolf Metzmacher, Tilla Briem, Lore Fischer, Pamela Coburn and many others.