The first news about this release announced it would used the mic, so I thought it would be a karaoke game. Actually, it's more like Tatakae Ouendan, using the pen to do choregraphies matching the lyrics' tempo.
Kayou is refering to popular songs, but not in the "classical" acception of the term : the setlist is compouned of late 80's pop hits such as CCB/Romantic ga Tomaranai, Onyanko Club/Sailorfuku o nugasanaide, etc etc. So it rather rocks for those enjoying that period !!