He did a very good job, that's right. But there are some bands that better should've called it quits. There are Queen, Shadow Gallery and Alice in Chains, for example. In other bands it worked, look at Accept or AC/DC .
Bit late to the show here but just found out about the passing of Mike Baker, whilst I was listening to Room V. Genuinely upset :( What a singer, what a band!  but he will live forever in these albums.
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v They only have a few Power Metal elements in some songs (War For Sale, Deeper Than Life, Crystalline Dream) But the whole stucture and mentality of Shadow Gallery, is totally Symphonic Progressive Metal which obviously prevails. Maybe along, with a few Prog rock elements, especially in their Debut LP (1992), e.g. in the 17-min [url=http://www.youtube.com/watch?v=n8-r2yADOs0]City of Ice[/url] or in their 34-min epic "[url=http://www.youtube.com/watch?v=W9AZRd97rWY]First Light[/url]" from the album Legacy (2001).
v "every 2-3 years?" That's pretty close to the truth. 1992-2013, that's 21 years and 6 SG studio albums, which makes 3.5 years of waiting, on average. But, a creative stagnancy can happen to all bands after some point. In the 90's it was 3 years waiting, now it's close to 4 or 4+years break. But definitely worth the wait, because these guys, especially Gary, are prog perfectionists.