Staff member puts the ‘Macdonald’ viola made by Italian artisan Stradivari on a stand during a preview at Sotheby’s gallery in Hong Kong

A staff member puts the ‘Macdonald’ viola made by Italian artisan Antonio Stradivari in 1719, on a stand during a preview before Sotheby’s Spring Sales at Sotheby’s gallery in Hong Kong April 4, 2014. The rare Stradivari viola, considered to be one of the finest in existence, is expected to fetch more than $45 million in a sealed bids sale this spring, which would set a world record for the most expensive musical instrument ever sold. REUTERS/Tyrone Siu (CHINA – Tags: BUSINESS SOCIETY WEALTH)