Singles are OK for the pop music but would anybody buy "Money" single instead of "Dark Side of the Moon"?
Did anybody ever buy Frank Zappa's singles?
Even if the whole pop album is great like in Beatles or Bee Gees it's still a collection of singles accommodated in one playable media...
Single album is an interesting weapon of the show-biz at all times but should be used with caution by producer. Many times single would show-up on the store-fronts before the actual full-length album shows up to "kick-start" the machine of the more profitable market. Contrary the same song could become "old" too quick drowning the whole new album downgrades.
For me albums of Led Zeppelin, Frank Zappa, King Crimson, Pink Floyd and many other rock or jazz artists are "journeys" that you should start and finish individually. There are many bands that you cannot
