Ocean Guide

Ocean Guide (海導) is a song that was commonly sung as requiem for marines that have died in battle. It was introduced at the start of One Piece Film Z, when Zephyr sings it during his attack on Firs Island. Later Kuzan sings it before his meeting with Zephyr at Secon Island, desite not being a fan of the song. At the end of Film Z, Ocean Guide is used as piped music during Zephyr last fight and sacrifice against Borsalino and his marine platoon. It's was composed by Kōhei Tanaka.