One of the unspoken rules in the progress-fixated world of electronic music is that you don't get bonus points for dwelling on past glories. So when Yukihiro Takahashi — drummer, vocalist and dapper elder statesman of electro-pop — convened a star cast of musicians at Tokyo's Ex Theater Roppongi in January to perform faithful renditions of songs that he'd first recorded 30 years ago, it was, he admits, "partly tongue-in-cheek."