Met2 Caverns3

Caverns 2 is an ambient theme from Metroid II: Return of Samus and its remake Metroid: Samus Returns. It was originally composed by Ryoji Yoshitomi and later remixed by Daisuke Matsuoka.

Description
In Return of Samus, Caverns 2 is heard in Phase 2, in the tunnels and caves surrounding the Chozo ruins. This atmospheric theme consists of brief patterns of notes played at a high register, punctuated by periods of silence. What little melody can be heard often comes in the form of ascending scales. It can be heard here:

In Samus Returns, Caverns 2 received a full remix that plays in the uppermost caverns of Area 3. It is very faithful to the original track, but now the silence has been filled in with low ambience. The song was also extended, with a new dark and ominous section featuring a deep choir, tense strings, and a steady beat. It can be heard here:

The original Caverns 2 theme was also remixed as the Area 1 theme, where it plays in the same location as the original game. In this remix, the original chiptune is played quietly in the background over a slower version of the ascending scales performed by a flute-like instrument.