Adagio is what caught the attention of the IOC.
The Athens Organizing Committee for the Olympic Games (ATHOC) asked Tiësto to perform at the Olympic Games, making him the first DJ to play live on stage at an Olympic Games at the 2004 Summer Olympics opening ceremony in Athens, where he played for 90 minutes.[16] Tiësto flew to Athens in January 2004 to have a meeting with the ATHOC. His Tiësto in Concert DVD caught their attention, after which he was asked to write more tracks based on his opening tune "Adagio for Strings" which could fit in with the Olympic spirit and combine the classical with the modern age; They also requested that he play his own produced music. The first rehearsal was on Saturday August, 7, for an empty stadium; the second rehearsal was on Sunday August 8 with 35,000 volunteers, a lot of the people recognised some tracks like "Traffic" and "Adagio for Strings". The last rehearsal included almost 60,000 people in the stadium which was on Tuesday August 10, there were some technical problems, the mixer broke down, the monitors dropped out a couple of times and the music in the stadium was not continuously on the right volume.
During the parade on Friday, August 13, 2004, all participating nations introduced their athletes—10,500 in total There were 80,000 spectators, only 75,000 knowing about dance music.[17] During the course of his performance the Dutch athletes started dancing in front of the DJ booth and had to be moved on by officials. The performance included new tracks produced especially for the Opening Ceremony and songs that were created to complement the spirit and theme of the ceremony. A condensed studio-recorded album of the songs played on the Olympic set was later released, including new songs specially composed for the occasion, entitled Parade of the Athletes in October 2004.[18] In the liner notes, he noted the IOC requested that the music not contain any lyrics as they could be inadvertently misinterpreted.
http://en.wikipedia.org/wiki/Ti%C3%ABsto