The Eighteenth Century Quartet or 18 CQ as it was commonly referred to was one of the most interesting and innovative Aussie bands of the mid-Sixties. Founded and led during 1964-65 by renowned musician and songwriter  Hans Poulsen  This all-acoustic four-piece group, which had no drummer, featured multi-instrumentalist Ted Baarda, violinist Ron Snellgrove and bassist Steve Dunstan. The use of a baroque style and unusual instruments made it unique.

The second rendition active (1966-1967) was more pop-oriented. The line-up featured Keith Glass, guitarist John Pugh & bassist Frank Lyons and a series of drummers. They basically only cut 4 tracks and these are featured below. Hans remained as part of the second line-up for a while but then took his style and exited to pursue another path.