For the past month and a half, I've listened to very little but Petra (okay, so I'm going through an emotional time in my life) -- from More Power to Ya (1982) to Wake Up Call (1993). I used to think Greg X. Volz (their vocalist from the early days until his departure after 1986's live album Captured in Time and Space) had the best voice of any in rock music. His range was stunning. In fact, he could hit notes so high I used to compare him to Mickey Mouse.