We recommend registering all songs in your eligible repertoire.
You should, of course, register all new song releases moving forward.
You can register old songs. In some cases we’ll be able to get the old royalties for you; it depends on each individual society and their own set of rules.
Some societies will hold the royalties for six months, others will hold them for up to five years. But once the society’s deadline passes, everyone is out of luck, and the society is entitled to keep that money and distribute it how they please.
We definitely suggest that you register the old songs with us just in case there are still some royalties out there waiting for you. We’ll be doing some serious digging on your behalf.