In One Piece episode 697, there's a song when Ussop is defeating Sugar using his Haki. It starts at 0:53 in this YouTube video.
What is this song? Is it already released as a soundtrack?
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It is "The Straw Hats Gather and Head to Battle!" from the album "New World", track #44.
According to the OP's comment,
Ah, the song I was looking for was the one that sounds after that. And since it was answered, here it is: youtube.com/watch?v=TBKUNyxItyM