SAN FRANCISCO | Warner Music Group Corp. has agreed to distribute and license its copyrighted songs and other material through online video trendsetter YouTube Inc., marking another significant step in the entertainment industry’s migration to the Internet.

Under a revenue-sharing deal to be announced Monday, New York-based Warner Music has agreed to transfer thousands of its music videos and interviews to YouTube, a San Mateo, Calif.-based startup that has become a cultural touchstone since two 20-something friends launched the company in a Silicon Valley garage 19 months ago.

Perhaps even more important for YouTube is that Warner Music has agreed to license its songs to the millions of people who upload their homemade videos to the Web site.

“We are very excited,” YouTube co-founder and CEO Chad Hurley said in a phone interview Sunday.