Career
He is noted in particular for his recordings of music by Carl Philipp Emmanuel Bach. He was instrumental (along with the conductor Helmuth Koch) in the 20th century revival of C.P.E.Bach"s music Ruf studied harpsichord at the Hochschule für Musik Freiburg since 1946.
From 1967 until 1990, he taught at the Cologne School of Music, since 1971 as an ordenary life-time Professor.
He was director of the Seminary for old Music. Site Schott music