Two years later the brothers moved to a small shop in Balham and began selling accordions and guitars.

[1] In 1958, Watkins Electric Music introduced the Copicat, one of the first-ever portable tape echo units.

The shop sold the entire first production run of 100 Copicats on the first day, including the very first Copicat sold to Johnny Kidd of Johnny Kidd & the Pirates, whose guitarist used it on the group's UK hit song "Shakin' All Over".

Jimi Hendrix and his Band of Gypsys also used WEM PA equipment at outdoor venues in the UK.

WEM amplification can also be seen in footage of the Miles Davis Electric Band playing at the Isle of Wight festival in 1970, in Led Zeppelin's 1969 supershow in London, and in The Stones in the Park, one of the Hyde Park Free Concerts.