def alternate_version_of?(another_track)
      return another_track && short_title.downcase == another_track.short_title.downcase \
            && another_track.artist && artist.name.downcase == another_track.artist.name.downcase
    end
def alternate_version_of?(another_track)
      return another_track && short_title.downcase == another_track.short_title.downcase \
            && another_track.artist && artist.name.downcase == another_track.artist.name.downcase
    end
Compares 2 songs whether they're just different versions of the same song by the same artist
e.g. track "Some Song (Radio Edit)" is alternate version of "Some Song (Remastered)"
returns true also if the 2 songs are the same
@return [Boolean]