Listen to Proof of Principle online. Proof of Principle is an English language song and is sung by Psilocybian. Proof of Principle, from the album Electronica 100 Top Hits - Best Electronic Dance, Dubstep, Techno, Progressive, Ambient, Acid House, Hard Dance, Trance Anthems, was released in the year 2013. The duration of the song is 7:42. Download English songs online from JioSaavn.