Vibrations are the basis of string theory, the foundation of the universe. This dog is proof that music is the essence of the universe. Dogs and music, it doesn’t get any better than that. Oh, and beer too. Man, this video had it all.
Or it could be the clever Hans story. The dog wants food, say, or to go outside and pee, and as long as the owner is playing the guitar, the dog relaxes because he knows nothing is going to happen. Then when the playing stops, the dog gets attentive because it might be …. no, back to playing.