Hippasus
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I know this is a very nebulous topic that is for all intents and purposes impossible to objectively answer. Nonetheless, I think it is possible to attempt to objectively answer, and to do so successfully to some extent. Obviously, I am framing this openendedly. 'Influential for what?', one might retort. That's for you to decide. It could be cultural values in a certain time period or even politics. It could be the development of a certain style or genre, perhaps from the artist(s) being innovative or prescient in some way. It could be influential for some sort of music theory. One's personal tastes and biases are likely to reveal themselves in an attempt to answer this question, but there's nothing inherently wrong with that.