Quicksilver Messenger Service released seven albums between 1965 and 1975 but enjoyed only modest commercial success. Despite the lack of significant album sales the band came to define the so-called West Coast sound which engulfed the San Francisco Bay area during the late 1960s. The band's early career is perhaps typical of the time and their professional lives are punctuated by drug busts and incarceration followed by the inevitable personnel changes. The group's most famous album is 'Happy Trails' released in 1969. It was their second album and was recorded mainly at Filmore East during live performances. It provides an interesting period snapshot of the band who were at the peak of their career at the time. Sadly as the years rolled by several former members of Quicksilver Messenger Service passed away, but despite their relatively limited commercial success the band remain an enigmatic footnote to the West Coast rock era.