This is one of my favorite Warren Haynes performances. Simple song, yet so much passion into it.
Oh and here is an acoustic version of Old Friend by Derek and Warren.
Final comment: As much as I appreciate Warren's mastery of the genre, I simply adore Derek's playing. He brings so many fresh elements, while staying true to the style. Both are amazing. I could listen to them all day. Matter of fact, I kind of do.
Final final comment: I don't know if you have listened to any of the stuff Derek does with his wife, on the Tedeschi Trucks band. It's so wonderful to watch Derek sing with his guitar, while his wife does so with her voice. The have really created something special.