"Turn up The Eagles / The neighbors are listening..."
They could call it Quadio+.
Personally, I am so burnt out on the Eagles and have been this way for about the past 15 years and I'm not saying that I don't listen to them now. It's just a lot less frequent. Would I purchase a Quadio set? Yes, I would, but a Doobie Brothers box looks more enticing to me. I still play a lot of Doobies and hate to admit that, "Takin' It To The Streets", is the one album I've been playing the most in the past 5 years. To each their own.