I will write a description of this music, although my English may not be able to convey it.

This music is a good introduction to the open world field.

The way the sound expands at the beginning expresses the feeling of stepping into a vast expanse of land, and the music fades out at the end to allow for a seamless transition into the game.

The high notes represent the expanse of the ground.

download : https://ryusuke0215.itch.io/the-huge-grounds