This is a cover of Frédéric Chopin's "Prelude No.7 in A Major" from his 24 Preludes, Op.28 (famous in Japan for being used in a commercial for a stomach medicine) composed by Frédéric François Chopin. It has been arranged in an easy-to-listen-to pop style.
The tempo starts at ♪=68 and changes linearly. The ending is slow and relaxed with a reduced tempo.
It would be perfect for for calm or relaxed scenes.
※There is also a version with tambourine.