The fourth sample in the timeline is the Bicycle Theme from Pokémon Sapphire, which was composed by Go Ichinose around the time of 2002 in Japan. It is meant to play whenever the playable character is riding their bike. (5)
This song come from a game that was released for Nintendo's GameBoy Advance, a small portable console. The fact that this song utilizes five separate voices flawlessly while Tetris on the GameBoy struggled to incorporate three shows a clear evolution of the technology behind video game music.
Moreover, this song continues to follow the trend of sampling real instruments. At around twenty seconds into the piece, the sound of timpani being struck can clearly be heard. This signifies that the medium of video game music is no longer confined to the restrictive robotic sounds of the earlier, twentieth-century titles in the timeline.
From this point forward, all the standard voices could be found in any gaming console -- such as the pulse, triangle, and noise waves.