how do I identify songs in my Apple Music library that are linked to an ex-partner's account?

I have songs in my iTunes library that are linked to the account of an ex-partner. Every once in a while, usually when setting up a new iPhone, I get prompts to sign in to his account in order to validate those songs. The prompt eventually goes away, but only after I hit 'cancel' about two dozen times.

This isn't a life-or-death problem, but I'd rather just delete those songs from my library and be done with it. Problem is that I have no clue what songs came from his account.

So the big question is is there a way to easily identify those songs and delete them?

My devices:

-- 27-inch iMac, 2020 running Sonoma 14.6.1 & Apple Music 1.4.6.32

-- iPhone 16 Pro (running whatever came with the phone - it's still xfering from my backup!)