For a pure "pop" album, my number one choice is ABBA. Check out the CD single of "Santa Claus Is Coming To Town"/"Little Drummer Boy" for a taste of what might have been. I also would have liked to hear Queen record one, especially in the mid-late 70's era when the vocals were so rich and the instrumentation so layered and full. And for something a bit more interesting, how 'bout Electric Light Orchestra? So much of the Mannheim Steamroller/Trans-Siberian Orchestra stuff makes me think of what they would have done back in the day! Any other thought?