Tango.info music track date

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• DON'T include dates unless you have at least the year (e.g., 1953-00-00)
• Use a range [1939--1964] if the recording could be ANY recording within that range
• Use likely matches only (you have this in some cases now, e.g., 1930--1940--1945)
• Use something to indicate that a date does NOT match a recording, e.g., !1939