There is a light bulb icon on track 09 between "What" and "?!". As it is not possible to insert it, I've kept Wikipedia's idea: replace it with a star ☆ mark...
夏目純 = Jun Natsume
https://ja.wikipedia.org/wiki/%E5%A4...9B%AE%E7%B4%94
羽田一郎 = Ichiro Hada
Was a member of Toshinobu Kubota's backing band, MOTHER EARTH.
Booklet of GROOVIN' album:
https://blog-001.west.edge.storage-y...g_3?1459945451
His Facebook page:
https://ja-jp.facebook.com/hada.ichiro