What constitutes a double album?

[wondergirl9847]

I was thinking about this last night. What actually IS a double album? Is it 2 disks of music or 20 songs? Is it 24 songs?

If it's 20 songs then, why is it such an issue for SYW...I mean 18.....20....big whoop.

If a double album is 2 disks, then how many songs go on each CD? Could we have had like 30 songs? 15 on each disk?

Also, WHY didn't they ditch the Limited Edition and put Not Make Believe and No Limit/Love Minus Zero on SYW...BAM...20 songs?

I'm confused....as usual.