Цитата:
› [U] people in a society who are trying new and often shocking or illegal ways of living or forms of art:
In Britain and the USA in the 1970s, the underground was a powerful subversive force.
the underground
› a group of people who secretly fight against the government:
He was a member of the underground, harassing the invading army.
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То есть главным образом "андерграунд" или "сопротивление" по контексту. Если прям совсем экзотический текст, то просто "подземелья".
Получаем:
"Это гимн андерграунда/сопротивления"