You can learn a lot about a web site by peeking below the hood of its internal site search. And, based on Hitwise data out today, YouTube is a surrogate music video search engine.

Hitwise research suggests that 72% of the site’s Top 50 search terms from December 2008 are music-related — from L’il Wayne to Beyoncé, to song titles like “Womanizer” and “Heartless.”

That YouTube leans heavy toward music shouldn’t be a surprise. Universal Music’s channel is the most popular on the site, with 3.3 billion views, and seven of the top ten channels are music-related. We’ve reported previously that music is a strong monetization opportunity for YouTube — from affiliate links to formal partnerships, like the one that’s making money both for Google and Universal Music.

Related Topics: Google: YouTube & Video

About The Author: Matt McGee is Search Engine Land's Executive News Editor, responsible for overseeing our daily news coverage. His news career includes time spent in TV, radio, and print journalism. His web career continues to include a small number of SEO and social media consulting clients, as well as regular speaking engagements at marketing events around the U.S. He blogs at Small Business Search Marketing and can be found on Twitter at @MattMcGee and/or on Google Plus. See more articles by Matt McGee