In less than 3 hours, House of Prog will play most of Hair in a G-String and that's not all! Peter Jones, Colin Tench; Gordo bennett. Maybe even Phil Naro will turn up on air to talk about really deep and worrying things. On top of that, there may be a couple of free albums knocking around BUT if you know stuff.
If you know the album, that should be easy.
An example would be this: What the hell is this song below about? Who? How many who's? Get it perfect and that's a CD. Closest but not perfect = Digital!
There will be easier chances too but it may be worth checking the album a bit.