Many people casually use music on websites because “it’s not for pay” so they think there’s no need for a license and no risk for them.
The simple answer is – get a legal opinion. Reading “terms and conditions” and the law is a good start but is not the whole story. The best way to use music is to subscribe to a service that clears the music that they provide – OR – as another person suggests, have a bit done specifically for you with all rights.
One *might* be able to “get away” with marginal use of another’s work but with greater risk. Remember the BIG fines levy against folks who copied a single movie or album? Tens of thousands of dollars in legal fees and then much more in fines.
Why subject yourself, your family and your business to that type of lawsuit?