The Trip To Pirate's Cove/Tom Petty & The Heartbreakers

http://www.youtube.com/watch?v=LDStHQLSQWQ&feature=related

The best rock n' roll song of the year and one of the greatest rock songs ever written. 

Bluesy Tuesday

3 o'Clock Blues/B.B. King  (His very first release. The video is of a much later performance, of course.)

Travelling Riverside Blues/Led Zeppelin  (Page's riffage is awesome.)

Inner City Blues/Marvin Gaye  (The slickest voice among the motown bunch)

Distortion Therapy

Fly Away/Lenny Kravitz
Empty/Anathema
Join Me (In Death)/HIM

I Love You/Saigon Kick

http://www.youtube.com/watch?v=yTgSQuTzMEg

Story of my life.:)
Jokes aside, this song has one of the most beautiful guitar rhythms I've ever heard (4/4 time with the down-stroke muted).

Pale Blue Eyes/The Velvet Underground

http://www.youtube.com/watch?v=Nir4BnNIFmg

The song has a very real feel. I like how the voice falters in some parts. A great example of how controlled imperfection can enhance listenability.