Yeah, like that time when Blind Guardian said to Orphaned Land, "hey guys, that was a really awesome show!" and Orphaned Land was like "thanks so much, and your hair looks amazing tonight!":D
I almost always listen to complete albums and I hardly ever put a bunch of stuff on shuffle, so I guess I never think about it this way. But certain bands remind me of one another, so I'll be more likely to put on a Tool or Mars Volta album after listening to Rush, unless his voice was really getting on my nerves that day, I suppose.