X-BT2 is a track in Xenoblade Chronicles X, composed and arranged by Hiroyuki Sawano. It is track five of disc four from the Xenoblade X Original Soundtrack. The track is an instrumental version of Wir fliegen. It plays when Professor B uses his time machine at the end of Mystery Man. This article about Xenoblade Chronicles X is a . You can help the My English Wiki by expanding it.