In his 1999 Bach biography, Klaus Eidam devotes a few pages to the Toccata and Fugue. He considers it an early work, probably composed for testing the technical qualities of a new organ. He feels that the crescendo that develops through arpeggios, gradually building up to the use of hundreds of pipes at the same time, can show exactly at what point the wind system of the organ might become inadequate. In his view, some of the more unusual characteristics of the piece can be explained as resulting from Bach's capacity as an organ tester.