Originally the property of Earl of Plymouth, leased out to Lord Dillon, in June 1774 it was sold for £5,000 to Viscount Wenman, who on the same day conveyed it to Gallini, Bach and Abel.
In all about 22 musicians; this concert is reckoned the best in the world, every thing executed with the greatest taste and exactness; a very fine room 115 feet long 40 broad; it was almost full, every body Dressed; very elegantly painted; between the acts they go in another room underneath where you have tea; it is by subscription; it begins at 8 and ends at 10 every thing is elegant.In November 1776 Gallini bought out the shares of his partners to become the sole owner of the freehold.
Bach and Abel, continuing the tradition of subscription concerts they had started together in 1763, carried on organising festinos in the Rooms until 1783, when Gallini's father-in-law Lord Abingdon withdrew his financial support.
Until his imprisonment in 1795 for libellous statements concerning a "pettifogging lawyer" who had allegedly cheated him, Lord Abingdon switched his allegiance to the rival orchestra in the Pantheon.
From 1783 to 1793 programming was arranged by the violinist Wilhelm Cramer who led the group "The Professional Concerts", advertised as founded by "eminent professors of music, many years resident in London.
[7] In a diary entry from 1791, Charles Burney records:[8] This year was auspiciously begun, in the musical world, by the arrival in London of the illustrious Joseph Haydn .
Haydn himself presided at the pianoforte: and the sight of that renowned composer so electrified the audience, as to excite an attention and pleasure superior to any that had ever, to my knowledge, been caused by instrumental music in England.
There were also medical talks, including, on 1 March 1842, a lecture by the Scottish surgeon James Braid who gave one of the first public demonstrations of what he called neuro-hypnotism or "nervous sleep" by sending 18 members of the audience simultaneously into a trance.
Hector Berlioz narrated a performing visit he made in 1853: The day before yesterday I appeared again before the English public in the 4th concert of the Philharmonic Society of Hanover Square.
My new piece in an antique style (Le repos de la Sainte famille), delightfully sung by Gardoni, made an extraordinary impression, and had to be repeated.
The Rooms were used from 1868 to 1874 for meetings of the women's suffrage movement: in 1868, Emily Faithfull lectured on "The Claim of Woman"; in 1870 the second meeting of the recently formed London National Society for Women's Suffrage was held in the Rooms, presided over by Clementia Taylor (wife of the MP Peter Alfred Taylor) and addressed by Helen Taylor, Harriet Grote (wife of George Grote) and Millicent Fawcett; in 1873 a similar public meeting was addressed by Lady Anna Eliza Mary Gore-Langton (wife of the MP William Gore-Langton), and Eliza Sturge (niece of Joseph Sturge).
The following year the property was sold and became the premises of the Hanover Square Club, which had already been holding committee meetings there since ownership passed to Cocks.