That is totally not fair. Those are two very different questions, though if I were looking for a place where they overlap I'd have to say J. R. R. Tolkien. Not known for his poetry, but he did write a great deal of it. (even beyond what is in the LotR books).
Lots of hymns and classical songs lol
Abide with Me
Cannon in D
Farandole
The "little fugue"
Nearer, still Nearer
Be Still My Soul
And Can it Be
Nessun Dorma
And...yeah lol Maybe someone else has a more one-song answer
What is your favourite song?