Benzene Series

The Benzene Series (ベンゼン＼(^o^)／シリーズ) is a group of songs sung mainly by Kagamine Rin/Len composed by Owata-P. It currently consist of five songs, each titles with chemical names references, and presumably ongoing. Two of the songs from the series (Paradichlorobenzene and Antichlorobenzene) became some of Owata-P's most notable works.

Starting from "Paradichlorobenzene", the songs in the series were always uploaded at the exact same time and date for each year; which is on September 19 at 03:55 AM. It is consistent for three years straight (2009, 2010, and 2011). There are also several other patterns to it.

Background
The "Benzene" series is a series of abstract songs with chemical substances (particularly aromatic compounds derived from Benzene) as their titles.