Horsley stu­died mu­sic pri­vate­ly, then be­came or­gan­ist of Ely Cha­pel, Hol­born, Lon­don, in 1794. He as­sist­ed Dr. J. W. Call­cott (who en­cour­aged him in per­se­ver­ing at Glee-writ­ing, at which he be­came suc­cess­ful) as or­gan­ist of the Asy­lum for Fe­male Or­phans, and mar­ried Call­cott’s daugh­ter. He suc­ceeded Call­cott in 1802, hold­ing that post 52 years. A dif­fer­ence of opin­ion with the Asy­lum Com­mitt­ee led to him be­ing dis­missed. In 1838 he al­so be­came or­gan­ist of Charterhouse at a sal­a­ry of £70 and a room set apart and a fire provid­ed when ne­ces­sa­ry for his use on those days up­on which his du­ty re­quires his at­tend­ance at the Hos­pi­tal. He found­ed the Lon­don Phil­har­mon­ic So­ci­e­ty, and in lat­er years was a close friend of Fe­lix Men­dels­sohn.

J. C. Hors­ley, the em­i­nent paint­er, re­lates in his Rem­i­nis­cenc­es the fol­low­ing ex­per­i­ence when he went with his fa­ther to one of the ser­vic­es:

‘When I was four years old my fa­ther was or­gan­ist to the Asy­lum for Fe­male Or­phans, which was a state­ly build­ing on the West­min­ster Bridge Road; and one Sun­day he took me in with him to the morn­ing ser­vice and land­ed me in the or­gan-loft. Ev­er­y­thing was new and sur­pris­ing to me, es­pe­cial­ly the crowd of bux­om girls, at least a hun­dred in num­ber, all dressed alike, ranged right and left of the or­gan, and who, when the or­gan had played a bar or two of the open­ing hymn, sang out with open mouths and such ener­gy that I was po­si­tive­ly scared, and in con­ti­nent­ly ac­com­pa­nied the per­form­ance with a pro­longed howl; up­on which my fa­ther, con­tin­u­ing to play the ac­com­pa­ni­ment with one hand, sup­plied me prompt­ly with pa­per out of his ca­pa­cious pock­et, where he al­ways kept a store of backs of let­ters (en­ve­lopes were not in­vent­ed then), and a sil­ver pen­cil-case of he­ro­ic pro­por­tions, thus qui­et­ing me.’

Lightwood, pp. 171-72

• Frost, p. 677
• Lightwood, pp. 170-72

1. Belgrave
2. Horsley