The Quicksilver Messenger Service (hence referred to as QMS because I type slowly) was one the psychedelic bands from San Fransisco that formed in the 1960s. The history of them is sort of obscure, because few documented sources are available, but there is some information available.
Like many bands, particularly American ones, at the time, their lineup changed often. The origin is sort of obscure, but as best as can be pieced together it was the brainchild of the following musicians.
Folks at Docudharma get a preview, since only one post a day is allowed at Kos. I like you, and wanted to let you see it sooner.