So, to answer my own question, posed earlier in this thread: A bunch of Happy Hardcore producers put out no-name singles that remixed rave tunes as happy hardcore. So Slipmatt had the SMD series, Wishdokta had Naughty Naughty, Red Alert and Mike Slammer had the '?' series, Sy and Unknown had the 'DJs Unknown' series, DJ Pooch had the '4 the Floor' series, and there were many more.
― 3×5, Tuesday, 18 August 2015 22:09 (eight years ago) link