Also released in March 2007 was a duet project by John Schlitt and Bob Hartman entitled Vertical Expressions, under the band name II Guys From Petra.
discography | Petra | Petra Haden | Petra Markham | Petra (band) | Petra Němcová | Petra Arkanian | The Bitter Tears of Petra von Kant | Sultan Yahya Petra Bridge | Sekolah Menengah Sains Tengku Muhammad Faris Petra | Petra Roth | Petra Rampre | Petra Praise 2: We Need Jesus | Petra Majdič | Petra Lammert | Petra Bagust | PETRA | Pam Tillis discography | Bad Boys Blue discography | What It Meant: The Complete Discography | The Kelly Family discography | Sultan Ismail Petra Airport | Silvester Petra Sancta | Rain discography | Petra Yared | Petra's | Petra Rossner | Petra Nemcova | Petra Müllejans | Petra Kelly |