"Vortex" is a maxi-single

Single (music)

In music, a single or record single is a type of release, typically a recording of fewer tracks than an LP or a CD. This can be released for sale to the public in a variety of different formats. In most cases, the single is a song that is released separately from an album, but it can still appear...

 by the Japanese

Japanese people

The are an ethnic group originating in the Japanese archipelago and are the predominant ethnic group of Japan. Worldwide, approximately 130 million people are of Japanese descent; of these, approximately 127 million are residents of Japan. People of Japanese ancestry who live in other countries...

 rock band, The Gazette. It was released on May 25, 2011 in two editions; the "Optical Impression" edition and "Auditory Impression" edition. The first edition includes two songs "Vortex" and "Uncertain Sense", and a DVD containing the music video and making for the song "Vortex". The second edition comes with a bonus track "Break Me".

Vortex: Optical Impression

Disc one

1. "Vortex" - 4:07
2. "Uncertain Sense" - 3:28

Disc two (DVD)

1. "Vortex: Music Clip + Making" - 7:03