BTTB is a 1999 piano solo album by Ryuichi Sakamoto. The album title is an acronym for "Back To The Basics".
Transcription done by request from one of my listeners: https://www.dropbox.com/s/d5llatfppl3emoc/Reversing.pdf ...
It is a record when playing it with Steinway D274 of the hall. It is a work named Reversing of Ryuichi Sakamoto. The score by the composer's own revision is ...