Regent Sound Studio at No. 4 was founded in July 1961 based above the offices of Essex Music. It was frequently used by the Rolling Stones manager Andrew Loog Oldham. The band recorded their first album at Regent Sound in 1964 and the single "Not Fade Away" became their first major hit to be recorded there. Oldham liked the atmosphere in the studio as he could "stretch out a bit, experiment and learn from our mistakes". The studios eventually expanded and moved into new premises on Tottenham Court Road, while the Denmark Street premises became the sales office. They were subsequently bought by music publisher Eddie Kassner at the end of the 1960s.

A vast number of successful 60’s and 70’s bands started their recording careers at Regent Sound. From demos to singles and full albums, these include (besides The Rolling Stones), The Jimi Hendrix Experience (cutting some rough demos and rehearsing), The Kinks (early demos), The Who (part of ‘A Quick One’), Elton John (playing sessions), The Lower Third with David Bowie (demos),  Black Sabbath’s first two albums and early albums and singles from The Bee Gees, The Troggs, Slade, Tom Jones, Sandie Shaw, The Equals, John Martyn, Davy Graham, The Yardbirds, The Amen Corner, Herman's Hermits, Brian Poole and the Tremolos, The Downliners sect, Mott The Hoople and countless others. The Eagles rehearsed sessions for ‘on the Border’ (Recorded at Olympic) here.

Sources: Wikipedia, https://www.regentsounds.com,  https://www.classicrocktourlondon.com/, http://www.peermusic.uk/