One reason why European music has had such a strong influence throughout the world, and why it is a sophisticated achievement, is that over time the original function of the music—whether ritual, dance, or worship—gradually became an aspect of its style, not its defining force.
Statements
The fact that the original function of European music (be it ritual, dance, or worship) eventually became part of that music's style, not its defining force, is part of why it's hard a strong influence globally and why it's a sophisticated achievement.
The music could stand apart from its original function because each composition had so much internal coherence that the music depends on nothing but itself.
Evaluate
When we're doing Must Be False, we're looking for an answer choice that contradicts what we know. Generally, that will take the form of contradicting a strong/conditional idea we were given, or it will contradict some inference we could have made by combining the available claims.
In this case the 2nd sentence seems like an elaboration of the 1st, so it doesn't look like we get a good inference by combining them.
But the last claim jumps out to me as the strongest / most conditional -- European music depends on nothing but itself.
Goal
Look for something that contradicts either the causal relationships revealed in the first sentence, or the very strong final claim.