Here's a rare video of the top artists then in one stage. They are considered as the Big 3 of OPM then because of their contribution to the OPM industry.
During the '90s, OPM has a great demand in every Filipinos. Everyone wanted OPM songs, mostly youths. It was a great era then, in which OPM reach it's golden period. In every radio station you will hear some Eheads songs or Rivermaya songs.
Then Francis M. introduced a new genre that will be easily accepted by Filipinos, this is the combination of rap and rock. He's songs became an instant hit in the charts these include Mga Kababayan Ko.
Like Eraserheads, the 90's Rivermaya also gain popularity in the OPM industry. Their songs became a hit, these include Elesi and Hinahanap-hanap Kita. Rivermaya's frontman then was Bamboo while Rico Blanco is the one who compose mostly of their band's songs. Rivermaya then has a great chemistry.
Imagine if this three acts performed together? Then you should see this video if you want to hear the songs of the Big 3 that contributed in the golden years of OPM. This was taken in 1998 "Pagdiriwang ng Bayan: The Expo Pilipino Inaugural Special".
Here's the video in which the Big 3 are in one podium:
90s was really great, it was the decade of OPM not KPOP. It was the decade where Filipinos wanted the local songs, the decade where everyone loves OPM.