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We normally associate organ music with the church, and with large, powerful instruments which produce a thrilling variety of sounds. But Handel's organ concertos were actually composed for the Theatre, and were intended for small, portable English organs which had a light, delicate tone, and were provided with just a handful of stops, but no pedals. Handel's concertos were deliberately popular in character, and were designed to entertain audiences during the intervals of his choral works and oratorios.
Handel's improvisation did not stop with the introductory "voluntary movement". In later life, after he had become blind, he tended to avoid playing his earlier concertos from memory, and according to one eyewitnhess he chose instead to 'trust to his inventive powers... giving the band only the skeleton, or ritornels of each movement, he played all of the solo part extempore, while the other instruments left him, ad libitum, waiting for the signal of a shake, befrore they played such fragments of music as they found in their books.The published versions of Handel's later organ concertos bear this out. In the Concerto in D minor (Op.7 no.4), for instance, the second movement contains a total of six "ad libitum" markings for the soloist which actually require the improvisation of whole passages incontinuation of ideas suggested by the composer. Thus no two performances of the concerto should ever sound exactly the same, especially since the third movement is left entirely to the discretion of the performer.