<Li> Piano duet (four hands)--an engraved copy of Holst's own piano duet arrangement was found by John York . </Li> <Li> Two pianos (duo)--Holst had originally sketched the work for two pianos, due to a need to compensate for the neuritis in his right arm . His two friends Nora Day, and Vally Lasker had agreed to play for him the two - piano arrangement as he dictated the details of the orchestral score to them . This they wrote down themselves on the two - piano score, and used as a guide when it was time to create the full orchestral score . The two - piano arrangement was published in 1949 . Holst's original manuscripts for it are now in the holdings of the Royal College of Music (Mars, Venus, Saturn, Uranus, Neptune), Royal Academy of Music (Mercury) and British Library (Jupiter, Saturn, Uranus). </Li> <Li> Organ--American harpsichordist and organist Peter Sykes transcribed The Planets for organ . </Li> <Li> Ensemble or Chamber Orchestra--English orchestrator George Morton transcribed The Planets for 15 - piece ensemble or chamber orchestra . </Li>

What is the time signature of mars the bringer of war