Lets' make this simple. Without going into heavy,long drawn out detail,here's my personal opinion. 20th century & rock era only:
1955,1956,1957,1963,1964-1969,The Seventies,1982-1985,1987,1992,1994,1996.
Plain & simple. Don't ask me why.
Later!
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Borderstone,gonna post some lines tonight!:D