This past weekend Japan got a Slice of Ultra, when some of the most amazing artists gathered together to perform at this ginormous festival. Martin Garrix had a well anticipated surprise for the audience. Earlier this month, after all the hype from Headhunterz & W&W\’s track \’Shocker\’, Martin Garrix decided to pair up with Headhunterz as well. During his set at Ultra Japan, Martin Garrix debuted the track he worked on with Headhunterz. It has been referred to as Once Again, but is not the official track name.