Unsung rhymes with:
sung, among, bung, chung, clung, dung, flung, fung, gung, hsiung, hung, junge, kung, kyung, lung, mcclung, myung, nueyung, overhung, phung, pung, rung, slung, sprung, strung, stung, sung, swung, tongue, tung, ung, wrung, young, yung
Unsung sounds like:
unassuming, unceasing, unconscious, uneasiness, uneconomic, unionizing, uniqueness, unisons, unknowing, unknowns