How to add purchase songs from itunes into iphone

A few years back (like a decade or longer) I purchased several songs on itunes. A few years later, those songs were removed from itunes (I guess for copyright issues), I can no longer find them or purchase. I still have them on my itunes on my Mac and now, I am trying to listen to them on my music on my iphone but I cannot find a way to move them.

How can I listen to those songs on my phone (iphone 13 pro max)?

Thank you.