Mixed CD: Strummin'

Tonight, I'm making a mixed CD for my brother-in-law. The theme: Strummin' Songs

When making a compilation, I cast a wide net, bringing in every possible song by every possible artist - starting with about 40 songs. Then narrowing that list to the final 15 or so (depending on the song length).

I am about half way through my initial list compilation and am stuck. Here is my current list. Any suggestions?

Ruby, Don't Take Your Love To Town - Cake
Thought I Knew You - Matthew Sweet
I Wanted To Tell You - Matthew Sweet
Blue - The Thorns (Matthew Sweet and others - covering the Jayhawks song)
Among The Living - The Thorns
*Amie - Pure Prairie League
Gonna Make You Love Me - Ryan Adams
New York, New York - Ryan Adams
Comin' Atcha Live/Truckin' - Tesla (I've always had a soft spot for Tesla.)
Dead Flowers - The Rolling Stones
Bootleg - CCR
Cross-Tie Walker - CCR
Have You Ever Seen The Rain? - CCR
*Cotton Fields - CCR (though I think I put this one on too many compilations)
Don't Look Now - CCR
Leather and Lace - Stevie Nicks with Don Henley
I Should Have Known Better - The Beatles
The Ballad of John and Yoko - The Beatles (Can you believe this song went to #1?)
Ten Years Gone - Led Zeppelin
Gallows Pole - Led Zeppelin

Again, I'm trying to create an initial list that I can then narrow down to about 15 songs.

Suggestions?

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*CCR's Cotton Fields


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*Pure Prairie League's Aime (though the cut single version)