NOTE: The OST album for the Studio Ghibli film "Ocean Waves" ("海がきこえる" or "Umiga Kikoeru") contains TWO related tracks. Track 02, "Umiga Kikoeru," is instrumental in the key of G-Bb-G (approx. 6 min.). Track 10, "Umini Naretara" (ending theme), is vocal in the key of D (approx. 4.5 min.). Both of these pieces are composed by Shigeru Nagata and develop around the same theme in different ways. 

This is a set of two versions of scores as shown below:

[A] Corresponding to the full length of the OST Track 10 (about 4.5 min.)

[B] Shorter and simpler

These arrangements are based on a transcription of the OST and as such, other instruments (guitar, cello, strings/violins) are also represented where applicable.

Note: The linked video includes both versions A and B in that order.