In a number of works for musical theatre - ''The Rat-catcher'' (The Pied Piper) based on a libretto by Michael Ende, the opera ''Eduard auf dem Seil'' (Edward on the Tightrope) on a story by Mörike and ''Der Schimmelreiter'' (The Ghost Rider) based on the well-known novella by Theodor Storm - Wilfried Hiller has used the organ to illustrate exceptional dramatic scenarios. The addition of further works has now resulted in a collection of Toccatas, some of them playful, some meditative, which may be performed individually or as a cycle, either in concert or for tuition purposes.