I own the following John Denver albums, with my favorite songs from them in ():

Poems, Prayers, and Promises (Gospel Changes, Fire and Rain, My Sweet Lady)
Aerie (Everyday, City of New Orleans, Casey's Last Ride)
Rocky Mountain High (Rocky Mountain High, Darcy Farrow, Spring)
Greatest Hits (erm...)
Farewell Andromeda (Farewell Andromeda (Welcome to my Morning), I'd Rather Be a Cowboy (Lady's Chains), Rocky Mountain Suite (Cold Nights in Canada))
Back Home Again (Thank God I'm a Country Boy, Annie's Song, The Music is You)
Greatest Hits Volume Two (erm...)
An Evening With John Denver (Today, Toledo, Forest Lawn)
Country Roads Collection (erm...it's a compilation)
The Best of John Denver (compilation)
The Best of John Denver Live ("")
The Wildlife Concert ("")

If you were to add 5 songs to my collection, I could add three other albums to that.

Toby Keith:
Boomtown (Who's That Man, You Ain't Much Fun)
Unleashed (Losing My Touch, It's All Cool, Huckleberry)
Pull My Chain (My List, I'm Just Talkin' 'Bout Tonight, I Can't Take You Anywhere)
Greatest Hits, Volume Two

Alan Jackson:
Drive (Drive (For Daddy Gene), Where Were You When the World Stopped Turning, Work in Progress)

Bah, I own a lot more, but I'm bored with this post by now.