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Demand for passion investments, like owning rare musical instruments, is growing and outstripping the desire to drive a classic car, or buy diamonds and antiques. Investors have tuned into a melodic way of making money and historic instruments are striking a financial chord, as the ÃÛÑ¿´«Ã½'s Mike Johnson explains. (Picture: A 1729 Stradivari violin. DON EMMERT/AFP/Getty Images.)