In all honesty, they aren't that different in sound to Creed. A lot of people hold Alter Bridge in higher reguards than Creed, since Scott Stapp is not the vocalist. Myles Kennedy's vocal style is not all that different than Scott, IMO.
Another difference in Alter Bridge vs. Creed, is the religious references in the lyrics. Alter Bridge lacks these references
I am just getting into this band after seeing Myles Kennedy with Slash at Donington (Download) and being blown away with what they gave us. A friend suggested I get hold of "Blackbird" and so I did ... all I can say is I regret not getting it when it came out cos it's brilliant, I just can't fault it. So on to the next pick up for me, what a band.
I have their entire catalogue. It isn't like they have a dozen albums to sift through, so why dont you begin with the debut:
One Day Remains.
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Highlights for me off this album would be
Shed My Skin