SA-X Appears is a music track in Metroid Fusion (so named in the Metroid Prime & Fusion Original Soundtracks) that plays when the SA-X is nearby. It consists of both a slow, stealth theme, and a frantic theme that plays whenever the SA-X has detected Samus's presence and is chasing her. Both themes stop playing when Samus or the SA-X has left the room. The track was composed by Minako Hamano, who described the chase portion of the track as the "most hysteric" she had done for the game. The track can be heard here: [1]