Well generally when you create a new band you try to shed the image of your old band. Considering you are trying to establish your sound. If you play cover songs of your old band it looks like your just trying to live off the old band's success. Now this doesn't mean that you no longer believe in your old band, it just means you want progress with the thing you like to do (music), instead of looking to the past.
Ill ask you this, Would you want Audioslave playing Rage or soundgarden covers? I know i wouldn't. Morello playing Soundgarden's background? Cornell raping? OMG. IT's the same with creed/Alterbridge/Mayfield 4. They are trying to establish a sound that isn't creedish because creed is no more!
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