Unknown trance tracks from around 1998 - 2003

1- https://www.youtube.com/watch?v=vdH-ejcA1rc

2- https://www.youtube.com/watch?v=GhLkij6o6DE

3- https://www.youtube.com/watch?v=k6SjEoK93Qo

4- https://www.youtube.com/watch?v=uawj1ttqQko (Played by Paul Van Dyk at least 2 times in december 1999)