An Emblem is a type of representation, here it means the songs represent something that is rebellious.
Consider the statement "Berry 's songs are plausible representations of rock'n'roll rebellion or , at any rate , youthful hedonism .". Based on this "Berry 's songs are plausible emblems of rock'n'roll rebellion or , at any rate , youthful hedonism ." a true statement? Yes, no, or I don't know?