What rights does a songwriter have when a song is made out as a youtube video by another artist?
<p>I have given permission for another artist to record a song that I have written and that song will also have a video which will most likely go on youtube. 
What are a songwriter's rights in terms of youtube revenue no matter how small ? </p>

<p>When you license your IP (like a song) you can specify the terms and conditions of its use by the licensee, including revenue shares from any derived work.</p>

<p>However, if, as your comment suggests, you grant an "informal" license, and later decide that you want to "firm things up" with a license having different terms, that's a matter you would have to either negotiate or litigate with your counterparty.</p>

<p>If you want a common reference point for negotiation of this sort of license, you might have a look at <a href="https://law.stackexchange.com/a/14716/10">compulsory license terms</a>.</p>

copyright intellectual-property music