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 product also contains part scores for Voice/Flute/Oboe/Clarinet/Alto sax/Trumpet with Piano Accompaniment (including part scores)

This is a set of two versions in different keys as shown below:

[C] In the key of D (Instrumental, but the voice part also included)

[E] In the key of Bb (Vocal + piano, but other parts also included)

The arrangement corresponds to the full length of the OST Track 10 (about 4.5 min.). It is based on a transcription of the OST and as such, other instruments (guitar, cello, strings/violins) are also represented in the piano accompaniment where applicable.

Note: The linked video includes both versions C and E in that order. The C version uses the oboe sound and the E version uses the sax sound.