William H. Cummings, A Dictionary of Music and Musicians (1900)
“ The club was limited to twenty professional and twenty non-professional members, who met twice a year; on the second Thursday in February, when they dined together, and on the last Thursday in July, when they assembled in Westminster Abbey, at the morning service, by permission of the Dean, for the purpose of assisting in such Purcell music as might be selected for the occasion. On the evening of the same day the members again met to perform secular music composed by Purcell; the soprano parts were sung by the chorister-boys from Westminster Abbey, the Chapel Royal, and St. ”
