Double Albums/CDs, curse or blessing?


For no good reason, I have been thinking about the worth of double albums or cds that bands release. The only two that I can come up that make sense are the Who's Tommy and Pink Floyd's The Wall. These are obviously rock opera type albums that hang together. Excluding Greatest Hits which might make sense, are there others doubles that people think of highly?

Most other double albums (double cds more so) I am familiar with would have been much better if only the best material had made it onto a single disc. Examples in my view would be Red Hot Chili Peppers Stadium Arcadium, Guns N Roses Use Your Illusion I & II (at least they are sold separately).

While it may make the bands more money to issue doubles, I think that it generally cheapens the brand.

What do fellow agoners think?
dokosan
Most single CD's released in the CD era, if they are released on vinyl, are 2 record sets. How do we account for these?
A couple more good Live 2-album sets I think are:
REO Speedwagon - You Get What You Play For
Lynyrd Skynyrd - One More From The Road
A few to consider that have not been mentioned:

Stevie Wonder "Songs In the Key of Life"
Prince "Sign O' The Times"
Kinks "One For The Road"
Gutter Twins "Saturnalia"
Miles Davis "Friday & Saturday Night At The Blackhawk"

My favorite double LP: The Clash "London Calling"
10-03-09: Loomisjohnson
"truth be told, most good double lps would be great edited down to a single" (LP)

Well actually most single LPs could be edited down to a single 45!

Bob