Tin Ear Meaning

Example : 1973, Thomas Cable, "A Garland of Pomposities: Comment on Halle-Keyser Prosody," College English, vol. 34, no. 4, p. 593:  Despite their careless scholarship and a less tangible quality that some would call a tin ear for poetry, Morris Halle and S. J. Keyser, as metrists, have the considerable virtue of explicitness.2012, Ripping yarns: A revived spat between Japan and South Korea unsettles the United States, The Economist, 18 August 2012  Japan has often displayed a tin ear to South Korean sensitivities over the island, which it calls Takeshima, having acquired it in the process of annexing Korea.