Whispering gallery to the walls, an effect that was discovered in the whispering gallery of St Paul's Cathedral in London. The extent to which the sound travels at St Paul's can also be judged by clapping in the gallery, which produces four echoes. Other historical examples are the Gol Gumbaz mausoleum in Bijapur and the Echo Wall of the Temple of Heaven in Beijing. A hemispherical enclosure will also guide whispering gallery waves. The waves carry the words so that others will be able to hear them from the opposite side of the gallery. The gallery may also be in the form
Sacred Heart Cathedral, Wellington Lauridsen, James MacMillan, Douglas Mews, Eric Whitacre, Ola Gjeilo and many other composers including occasional commissioned contemporary works. The boys' choir is made up of about 15 boys from the neighbouring Sacred Heart Cathedral School. Each boy receives a scholarship which pays for weekly individual vocal tuition and theory lessons. The boys sing occasional Choral Mass during school term. The Cathedral Grand Organ is situated in the choir loft and the console in the whispering gallery. It was designed and built by Arthur Hobday in 1905 and has been revised and enlarged since with the changing needs of the cathedral.