It consists of three or four Harrow boys and one adult on each part (Soprano, Alto, Tenor and Bass). The choir sings a mixture of unaccompanied sacred and secular music, most of which comes from the Renaissance, Romantic and Modern periods.

Many of the boys are ex-choristers from leading cathedral and collegiate choirs – there have recently been representatives from the choirs of King’s College, Cambridge, Christchurch Cathedral, Oxford, St George’s Chapel, Windsor, Canterbury, Chichester, Winchester and Westminster Cathedrals, and Westminster Abbey – and most of the boys in the Byron Consort are Music Award Holders at Harrow School.

Since its inception the choir has sung regularly at services and concerts at Harrow and has sung at Salisbury Cathedral, Sherborne Abbey, St James’s Church Spanish Place, St Wilfred’s Hall and the Little Oratory at the London Oratory, Jesus and St Catharine’s College Chapels, Cambridge, and Exeter and Keble College Chapels, Oxford, and at the Temple Church in London. The choir sang to an audience of 6,000 people in 2003, appearing in an amplified outdoor concert alongside the Royal Philharmonic Concert Orchestra. One of its recent engagements was singing for the Duke of Marlborough, David Cameron and guests at a Christmas dinner at Blenheim Palace – its appearance on this occasion was featured in an article in The Spectator about the event: “The Byron Consort Choir of Harrow School is exacting in its choice of audience. It has sung for popes and for royalty – and the setting for its performance at Blenheim Palace one night last month was grand enough for either.”

In 2003, the choir made a CD entitled My Spirit Sang All Day, which was reviewed to much acclaim in Cathedral Music Magazine: "The top line is far superior to that of many cathedrals these days and is a testament to what a public school choir can produce. The intonation is forward and focused and the under parts well blended. This is a most excellent CD in every way and highly recommended."

The choir has been on eight overseas tours: in 2003 to the islands of Malta and Gozo where it sang at the Cathedrals of St John and St Paul in Valletta, at St George’s Basilica in Victoria, at Villa di Giorgio (residence of the British High Commissioner) and at Mosta’s famous Dome Church; in 2004 to Rome, where it sang masses in St Peter’s Basilica, Santa Maria Maggiore and Santa Maria in Trastevere, as well as a concert at the Villa Wolkonsky (residence of the British Ambassador to Italy), but perhaps most memorably of all, sang for the late Holy Father John Paul II in front of some 12,000 people at the weekly General Audience. In 2005 the choir travelled to Venice, where it sang at the Basilica of San Marco, at the churches of San Giorgio Maggiore, Santa Maria dei Miracoli and the Frari Basilica as well as travelling to Padua to sing in the Basilica di Sant’Antonio; in 2006 the tour destination was Florence, where it sang in the Duomo, the Churches of San Marco and the Santissima Annunziata and the Library of the British Institute, as well as at the Seminary of the Institute of Christ the King at Gricigliano and the Duomos of Fiesole and Pisa; in 2007 it visited Palermo on the island of Sicily where it sang masses in the Duomo at Monreale and in the churches of San Domenico and San Giuseppe dei Teatini in Palermo, gave concerts for the local preservation trust Salvare Palermo and for the University of Palermo, and also took part in Vespers with the monks of the Abbey of San Martino delle Scale.

In the summer of 2007 the choir returned to Venice to sing by invitation at the wedding of Tamara Beckwith, which was held at the Palladian church of Il Redentore and featured in Hello! magazine.