Klaus Wallrath studied at the Düsseldorf University of Applied Sciences from 1977 to 1982.
He completed his studies with the cantor examination.
After studying piano with Leonore Auerswald, Wallrath obtained the concert exam in the piano in 1985.
Wallrath has been a church musician at the St. Margareta Basilica since 1987, and since 1995 he has also been musically responsible as a pastoral church musician for the merged parish of St. Margareta (with seven churches).
During his time at St. Margareta, Wallrath built up several choirs and ensembles. In addition to the basilica choir, there is now a choir school for children and young people with over 150 young singers and the St. Margareta Chamber Choir.