Change Blog Address Without Deleting

I’m no longer a member of the band featured in my WordPress site’s web address. I want to consolidate my personal blog: @ http://mojobone,wordpress.com with the posts on my former professional blogsite, @ http://doubleadaddies.wordpress.com. I don’t mind deleting the old “mojobone” posts, but I need the new address to point to the posts that were formerly accessed by the “doubleadaddies” link. Any help?