August 15, 1960, Elvis Presley started a five week run at No.1 on the US singles chart with 'It's Now Or Never', also No.1 in the UK. The song which was based on the Italian song, 'O Sole Mio', gave Presley his first post-army No.1.
Source:
http://www.strictlyhardlyvinyl.com/2012/08/its-elvis-now-or-never.html