I've never been sure why there isn't more of a rivalry between Taylor Swift and Miley Cyrus, but, aside from some boy drama, the two country-tinged pop princesses seem to co-exist happily.If you missed Swift's excellent show at Jobing.com Arena last month, you'll have a chance to check out what I can only imagine will be a much, much shoddier performance by Billy Ray's spawn in September.A pretty poor substitute if you ask me, but still one of the more interesting shows in this week's slate of a
