Lawrence Wright was the first music publisher to set up premises on Denmark Street.

In 1911 Wright moved to London, hired a basement in Denmark Street No. 8 to sell his music, and set up the Lawrence Wright Music Co. Wright wrote songs under the nickname Horatio Nicholls, often together with lyricist Worton David. In 1914 they published "Are We Downhearted? No!", which became a popular marching song in the First World War. In 1918 Wright moved to Denmark street No. 11.

The music history of No. 8 continued. In 1932, Peer Music UK was set up here, run by local entrepreneur Tom H. Ward who, with his son Tom F. Ward went on to establish peermusic offices around Europe with the London office based in No. 8. Peer Music became the last major music publisher in the street. They moved out in 1992 completing the gradual transformation of Denmark street premises from publishers to instrument stores.
In the 60s Southern Music had a studio on the ground floor, which was used to record Donovan's hit "Catch The Wind".

Source: Wikipedia, http://www.peermusic.uk/