The Harmonicon was an influential monthly journal of music published in London

London

London is the capital city of :England and the :United Kingdom, the largest metropolitan area in the United Kingdom, and the largest urban zone in the European Union by most measures. Located on the River Thames, London has been a major settlement for two millennia, its history going back to its...

 from 1823 to 1833. It was edited at one period by William Scrope Ayrton (1804 - 1885.) Issues contained articles on diverse topics, including reviews of musical compositions, reviews of concert and opera

Opera

Opera is an art form in which singers and musicians perform a dramatic work combining text and musical score, usually in a theatrical setting. Opera incorporates many of the elements of spoken theatre, such as acting, scenery, and costumes and sometimes includes dance...

 performances, news of contemporary musicians and composers, features on music theory

Music theory

Music theory is the study of how music works. It examines the language and notation of music. It seeks to identify patterns and structures in composers' techniques across or within genres, styles, or historical periods...

and the physics of sound, and biographical sketches of important musical figures.