[Machine Translation] This is the first single from Takeyoshi Sato's life's work, the cover album series "Utajikara - CORNERSTONES 4". Sayonara" was sung by GAO in 1990 and became a big hit, selling 1.23 million copies. It is also a long-selling song that charted in the Top 100 of the Oricon Singles Chart for 47 weeks (about a year). The coupling song, "And I'm at a loss" (original song: Osawa Takashi Miyuki), has been covered by numerous artists and can be called a standard. Also included are live recordings from the "Welcome to my room Vol.2" live performance tour that was held until June 2007.