1. Psy - Gangnam Style -gangnamseutail- -usum71210283-.flac -

or Psy - Gangnam Style (USUM71210283).flac

But the most standard and functional filename would be: 1. Psy - Gangnam Style -gangnamseutail- -USUM71210283-.flac

1. Psy - Gangnam Style -강남스타일- -USUM71210283-.flac or Psy - Gangnam Style (USUM71210283)