Powerage is one of the most underrated rock albums of all time.
somebody said it already, but, Kim Mitchell
Fortunate son by CCR is actually really easy and will make anyone happy.
The Allman Brothers Band.

All the songs are epic.
Monkey Man-The Rolling Stones
Til The Morning Comes-Grateful Dead
Fortunate Son
American Woman
Purple Haze
La Grange
Whole Lotta Love
Highway to Hell
Heard it it a Love Song- Marshall Tucker Band
Pigs (Three Different Ones)-Pink Floyd
Down in the Hole-Rolling Stones
It Came With it.
I just got a new one. It is awesome. Tell me what you think about them.
Let There Be More Light-Pink Floyd
Gimme Back My Bullets-Lynyrd Skynyrd
Behind the Sun-Eric Clapton
Stand and Deliver by Adam and the Ants.

The song is awesome, and so is the video.
We're Not Gonna Take It-The Who
Candy Store Rock-Led Zeppelin
Ballad Of Curtis Loew-Lynyrd Skynyrd
A Hard Day's Night- The Beatles.
Here Comes the Sun-The Beatles
Alabama Song-The Doors
Dirty White Boy-Foreigner
Heaven And Hell-John Entwistle
Shine on You Crazy Diamond-Pink Floyd
No matter how many times I listen to Frampton Comes Alive I will never get tired of it.

His stuff with Humble Pie was also pretty good, especially their live album, Performance Rockin the Fillmore.
Little Wing-The Jimi Hendrix Experience
Rock 'N Me-Steve Miller Band
Pink Floyd
The Rolling Stones

So many good bands that all added something different to the classic rock spectrum that you can never just narrow it down to five.
Dreams-The ABB
Spirit in the Sky-Norman Greenbaum
I've Been Working-Bob Seger and the Silver Bullet Band
Tea For One-Led Zeppelin
Wild Eyed Southern Boys-.38 Special
I have no clue if you think that Robert Palmer is CR, but I think it is.
I also don't want this awesome thread to die.

Hey Julia-Robert Palmer
Shake Your Hips-The Rolling Stones
You're Sixteen-Ringo Starr
Railroad Song-Lynyrd Skynyrd
Back in the Saddle-Aerosmith