from the 1990's i'd say there are only a few that will live in the memory
REM - losing my religion
Oasis - don't look back in anger
Madonna - vogue
it was really quite a shite decade imo, not quite as godawful as the current one though, of which probably zero songs will be remembered
as far as dance is concerned though there will be about 20 trance songs from the 90's and 00's i'll remember, the likes of 9pm till i come, for an angel, silence, insomnia by faithless etc