Quartz Biography (Wikipedia)
Quartz is a dance production duo of Ronnie Herel and Dave Rawlings, known for their collaboration with Clubland on "Let's Get Busy", which went to number one on the U.S. Billboard Hot Dance Club Play chart in 1990.
Their album, Perfect Timing, produced the early 1990s dance hit "Meltdown", and also teamed them with Dina Carroll on a number of tracks, most notably a cover of "It's Too Late". Their records were released on the Mercury label.