One set that's always stood out for me is Easygroove @ Fantazia Second Sight. If you ever need to prove to somebody that rave music has variety, this is the set to play them. It's got so many different styles in it, and as one of the first tapes I ever heard it definitely shaped my tastes.
these are not my favourite sets, but i think they are game changers as they changed the direction of the scene
Dougal - dreamscape 8, the first anthem bashing set of happy tunes regardless of how old they were
oakie - Goa mix, cause its different
top buzz, fantazia new years eve - pure class, the whole set just flows with quality mcing too
sy - obsession the dream, just perfect time for sy in 93, mixing dark and happier tunes, quality set
slipmatt, fatazia new years eve 92/93 - shit event, but a good set which gives me goose bumps listening to it.
fabio book of love, first set of the night and set the tempo for the entire night