The album's title has two meanings: the first part is a homage to Satriani's nickname of "Satch", while "Musterion" is a Greco–Biblical word meaning "hidden thing", "secret", or "mystery". From the date of the album's release until April 11, 2008, Satriani began a special "Guitar Center Sessions" tour, followed by a worldwide tour on April 30. 　　All tracks were composed in 2007 with the exception of "Come on Baby", which, as Satriani explains, was written in 1993 amid a snowstorm during a vacation in Lake Tahoe. His son ZZ later encouraged him to finish the piece, upon which it became the third song dedicated to his wife Rubina (after "Rubina" from Not of This Earth, and "Rubina's Blue Sky Happiness" from The Extremist). It was later used by Canadian figure skater Vaughn Chipeur for his short program at the 2010 Canadian Figure Skating Championships. 　　"Revelation" was written about the death of fellow guitarist Steve Morse's father, as well as being a tribute of sorts to Morse's playing. 　　As with "One Robot's Dream" from Super Colossal (2006), Satriani continues with the theme of exploring the humanistic side of robots on "I Just Wanna Rock". On a podcast detailing the making of the album, he explained the track to be about a robot's experiences at a rock concert.