Flor Peeters, born in Belgium in 1903, is one of the most important organists and organ composers of the 20th century. After completing his studies at the famous Lemmens Institute in Mechelen, he worked there as a teacher of organ and improvisation before becoming professor at and director of the Royal Flemish Conservatoire of Antwerp. Until his death in 1986, Peeters gave concerts all around the world, held numerous master classes and received several awards and prizes for his achievements as a composer, organist and teacher. In his successful three-volume educational work 'Ars Organi', Peeters combines theoretical knowledge and practical exercises on all aspects of organ playing, starting with basic information on the instrument, manual and pedal exercises and two-part manual and pedal playing. While Vol. 2 contains exercises on three-part playing, Vol. 3 contains exercises on four and five-part playing as well as studies on demanding trio playing. Each learning stage is accompanied by pedal exercises and tips on articulation, touch, interpretation, registration and organ specifications - a valuable compendium for every organist.