Metal GearThe first two Metal Gear games kept a relatively simple score, following many games of the time. They did introduce reoccuring themes in a soundtrack very similarly designed to that of a motion picture, rather than the repetitive handful of songs that decorated popular Nintendo games, etc.
'Theme of Solid Snake' introduced in Metal Gear II
Metal Gear SolidFor the third installment and the first to be released on the Playstation, creators went even further toward film-intensity scoring, using a full orchestra to create a dynamic score that changed with the mood of the game. The famous warning levels of the series were hightened by the dramatic, powerful music.
Voice actors were also introduced, due to the new capabilities of the Playstation, most notably Akio Ōtsuka and David Hayter, whom both portrayed Solid Snake for the remainder of the series.
Metal Gear Solid II: Sons of LibertyGained special critical attention for the attention put into the score. Hideo Kojima approached Harry Gregson-Williams, a composer famous for his work with Hans Zimmer.
Theme to this game became one of the most recognizable pieces of music from the series.