Ocean Guide

'Ocean Guide (海導) is a song that was commonly sung as requiem for marines dead in battle. It was introduced in the start of One Piece Film Z, when Zephyr sung it during his attack to Firs Island. Later Kuzan sung it before his meeting with Zephyr in Secon Island, besides he really hate it. In the end, Ocean Guide is used as piped music during Zephyr last fight and sacrifice against Bossalino and his marine platoon. It's been composed by Kōhei Tanaka.