On the day of the execution, the bells were tolled as the condemned were led to Tyburn. In the north aisle of the church is the Musicians' Chapel. This Chapel (formerly a chapel dedicated to Stephen Harding) was dedicated The Musicians' Chapel by Dr W.R. Matthews, Dean of St Paul's, on 2 January 1955 in the presence of many distinguished musicians including an orchestra conducted by Sir Malcolm Sargent and the BBC Singers. The ashes of the conductor Sir Henry Wood, C.H., founder of the Promenade Concerts, who learnt to play the organ at the church as a boy, had been interred in the Chapel a decade earlier. There are four windows commemorating Sir Henry Wood, John Ireland, the singer Dame Nellie Melba, Walter Carroll respectively. The Chapel contains the Musicians' Book of Remembrance and both the Chapel and the Book of Remembrance are maintained by the Friends of the Musicians' Chapel. A Service of Thanksgiving for those named in the Book of Remembrance is held at the church each year as well as a Requiem close to All Souls' Day. Many concerts and memorial events for musicians have been held in the church over the years. In 2017 the Rector caused a storm in the media by ending the hiring scheme and excluding many choirs from singing and rehearsing in the church. A protest was held about this and many prominent musicians including John Rutter protested against the church decision. Attempts to mediate failed. The south aisle of the church holds the regimental chapel of the Royal Fusiliers (City of London Regiment) (merged to form the Royal Regiment of Fusiliers), and its gardens are a memorial garden to that regiment. The west end of the north aisle has various memorials connected with the City of London Rifles (the 6th Battalion London Regiment). The church was designated a Grade I listed building on 4 January 1950. The north aisle is dominated by a splendid organ built by Renatus Harris in 1670. The swell was added by John Byfield in c.1730. The organ was enlarged in 1817 by James Hancock and by John Gray in 1828 and 1835, and Gray and Davison in 1849, 1852 and 1855. It was rebuilt in 1932 by Harrison and Harrison. A specification of the organ can be found on the National Pipe Organ Register. It is not currently playable, and a Makin digital organ is used when required for services.