When Dream and Day Unite, by Dream Theater (1989): Since I've been rolling with a theme of "when lead singers leave," here's another one that fits the bill. Charlie Domenici is sort of the John Rutsey of Dream Theater, appearing on their debut album and then disappearing into the ether. Although James LaBrie certainly has his off nights (e.g., lots of Once in a LIVETime), he's got a better metal screamer style voice. He suits DT's material better. That being said, this is still a pretty excellent album, especially for a debut. I wouldn't want to live without "Only a Matter of Time" in my collection.