The Greeks and Roman pagans contributed far more. Philosophy, ethics, mathematics, medicine, the study of language, logic and rhetoric, astronomy, art, music, architecture... Pagans gave us that.
On the topic of music especially, Yes, it would sound the same, absolutely. Music theory was pioneered by the Pythagoreans (pagans). We still use the scales and ratios etc that they discovered. That's why the scales have ancient Greek names.
The Renaissance was the rediscovery of the knowledge of Pre-Christian Greece and Rome (though much remains lost) . The explosion in art, music, science and technology Christian Europe experienced is thanks to that rediscovery.
We'd be much more advanced if we never became Christian. Christianity set us back.
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