Short answers, pulled from the story.
Suikoden III features Hugo of the Karaya Clan, Chris Lightfellow, and Geddoe as its three separate protagonists. Players switch between these three perspectives after each chapter ends to piece together the full picture of war.
Suikoden III released in June 2002 with Japanese sales totaling 377,729 copies while American figures reached 190,000 total units sold. The game did not receive a PAL region release until it became available on PlayStation Network on the 23rd of June 2015.
The Trinity Sight System forces players to switch between Hugo, Chris Lightfellow, and Geddoe after each chapter ends. Each character sees different parts of the same conflict so no single perspective holds the whole truth.
Composers Michiru Yamane, Keiko Fukami, and Masahiko Kimura created the music for Suikoden III. The soundtrack released on two CDs on the 24th of July 2002 as Genso Suikoden III Original Soundtrack.
Series creator Yoshitaka Murayama departed along with other key staff members one month before the June 2002 release. He stated that credit omissions resulted from a Konami company policy not crediting former employees rather than corporate meddling.