I use a "search shortcut" as well with the "Alfred App" for Mac. It's easy to bind a shortcut to either search directly at the intended site, or perform a google search with the appropriate prefix (i.e. "site:rapgenius.com).

If you're finding that you continuously make such searches, it might be worth taking the time to set up your shortcuts. I have them set for Amazon, YouTube, Wikipedia, EtymOnline, etc.