If you sell a million albums, it does not take an accountant to figure out you are looking at serious publishing money. The third and fourth main areas for publishing money are print and synchronization licenses. These are small compared to performance and mechanical, but they are additional sources of revenue. A band receives publishing money from a print license any time the song is written down and published. Money from print licenses are usually a few cents per copy printed.
Videos are a good example of synch licenses.
In addition, commercials, movie soundtracks, and background music on TV are also examples of publishing money from synch licenses. The amount of money for a synch license varies widely. Each license will generate a different fee. Since figuring out how much money everyone owes you from your publishing can be difficult, many bands hire a publisher. A publisher's job is to collect all this money for you.