Let's say I have a band. We make a record, and we sell some records. We get paid for that. Now someone wants to use one of the songs in an ad. We "got paid"

Let's say I have a band. We make a record, and we sell some records. We get paid for that. Now someone wants to use one of the songs in an ad. We "got paid" to produce the work, but the people making the ad still have to pay us for that use of the song, because it's a different use than the one we got paid for.