Purchasing individual songs without Apple Music subscription
How do I purchase individual songs without an Apple Music subscription?
iPhone 16 Pro, iOS 18
You don't need an Apple Music Subscription to purchase songs.
To make a purchase, open the iTunes Store app(not the Music app), find a song you want and tap on the price of the song there to start the purchase process.
click here ➜ Buy music from the iTunes Store on your iPhone or iPad - Apple Support