Don't worry... I dutifully averted my eyes.
I think another good thing about this double bill is that perhaps it will garner appreciation by hardcores of one band for the other band. Yes, a lot of people were listening to both bands in the 70s. However, folks who missed that boat might only be into one of the groups. Remember, it was the Two Voices tour that introduced me, a Fleetwood Mac fan, to the world of the Eagles - and look at me now! Many other Mac fans will see the Eagles perform and undoubtedly realize (or be reminded of) how awesome they are... and vice versa.