for a song

[WrigleyF]

How would you go about getting permission to use a copyrighted song on your business website?

[auryn]

You can ask for it. If you know who the copyright owner is, you may contact the owner directly. If you are not certain about the ownership or have other related questions, you may wish to request that the Copyright Office conduct a search of its records or you may search yourself. See the next question for more details.

Check U.S. Copyright Office - Can I Use Someone Else's Work? Can Someone Else Use Mine? (FAQ)