It can play on a single or up to 15 nickels and has the ability to run for approximately an hour. The “Double Mills,” as it was nicknamed, plays classical, operatic and popular music. government in 1909 as one of the eight greatest inventions of the decade when it was introduced at the Alaska Yukon Pacific Exposition, the Mills DeLuxe Violano-Virtuoso stands as one of the most important and incredible musical devices ever made. One of only a handful ever made, this Double DeLuxe Violano Virtuoso, created by the Mills Novelty Company, is an extremely rare example of American musical automata, featuring not one, but two brilliantly tuned violins.