the sides of the case. New 75 per cent tin front pipes were made and the case completed with back, side walls and roof. Pierced panelling executed by Derek Riley of Lyndale Woodcarving in Saxmundham, Suffolk, was provided to allow sound egress from the bottom of the case. The old console has been retained but thoroughly rebuilt with modern accessories and all-new manuals. Twenty-two of the organ's 83 ranks contain some pipework from the 1868 instrument. Four ranks are made up entirely of 1868 pipework, and 21 contain 1895 pipework. Only two ranks are entirely of 1895. Forty-eight ranks contain some new pipework, 34 of which are entirely new. Old wind pressures have been used wherever possible. The old wind reservoirs have also been restored rather than replaced. The instrument has tracker key action on the manuals, with electrically assisted tracker action to the pedals. The stop action is electric throughout. Continuo organ A four-stop continuo organ was built for the abbey in 1999 by Northampton-based organ builder Kenneth Tickell. The instrument, contained in a case of dark oak, is portable, and can be tuned to three pitches: A=440 Hz (modern concert pitch), A=415 Hz and A=465 Hz. It is also possible to tune at A=430. A lever pedal can reduce the stops sounding to only the 8' stop and, when released, returns the organ to the registration in use before it was depressed. Choir The abbey has sections for boys, girls, men and children (the Melody Makers). As well as singing at the abbey, they also tour to cathedrals in the UK and Europe. The choir has broadcast Choral Evensong on BBC Radio 3, and has made several recordings. It performed at the Three Tenors concert for the opening of the Thermae Bath Spa. The abbey is also used as a venue for visiting choirs and, from its inception in 1947, the City of Bath Bach Choir. The choirs of Bath Abbey sung the 2015 Christmas Service live on BBC One. They are led by the directors of music and assisted by the organists. The current Director of Music is Huw Williams who took the role in 2017. He replaced Peter King who served from 1986 to 2016. Discovery Centre museum The Bath Abbey Discovery Centre is located beneath the Abbey shop, and featured artefacts and exhibits about the Abbey's history. Displays included the history of the building of