Song debut

If I’m understanding one of the posts on the ARK correctly, Hyde and his band publicly played a new (?) song for the first time at the Yamagata concert. It’s referred to as FIRST SONG, but that could be just because they played it at the beginning. The following is said to be from Hyde’s manager’s online diary:

It was something I heard a bit of a few days ago, from the recording in L.A. It was the first song Hyde composed. It's great! A super rare sound, and it was debuted today at the live. In rehearsal, everybody kept changing the arrangement and told the staff, "We are practicing." So, it wasn't included in the setlist. But! As a secret surprise for all the staff, and without any warning, they played it as the first song. I was the only one who knew. The staff went around saying, "They did it!" It felt great. It's instrumental, and it will grow with the tour. We will be able to hear it again…