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It will all depend on how you setup your blog, a subdomain or a subfolder. subdomain: http://blog.example.com subfolder: http://www.example.com/blog/ If you are setting the blog up as a subfolder, then yes, the blog will help the site, and vise versa.  (It will also hurt the site as well).  For optimal SEO, I would do it this way. http://www.example.com/blog/ Rand wrote a great post about this topic here: Root Domains, Subdomains vs. Subfolders and The Microsite Debate http://www.seomoz.org/blog/understanding-root-domains-subdomains-vs-subfolders-microsites

ReverbNation has an incredible natural link profile that builds up a ton of authority. Spammers and hackers take advantage of this by setting up content on ReverbNation and then pointing tens of thousands of spam links directly at the pages. This allows them to rank temporarily.