The key is field. A physicist use maths will not get maths prize if just use it for physics.

He use words and its lyrics has meaning, like any literature. Cannot say poetry is not literature. Then why not poetry with music, probably more traditional as many poems are songs. In some culture, it must be singable.

These use physics but not in the field of physics. Otherwise anyone use qm can get Nobel prize and chemistry people can get one as they all use physics. Really need to be in the physics field. You can use other method like computer, maths.