| Sigma | ||||
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&sq=Facebook&lang=en&file=File:Reoldigitalandcdcover.png) Standard CD and digital artwork | ||||
| Studio album by | ||||
| Released | October 19, 2016 | |||
| Recorded | 2015–2016 | |||
| Genre | ||||
| Length | 46:38 | |||
| Label | Toy's Factory | |||
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| REOL chronology | ||||
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| Singles from Sigma | ||||
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Sigma (stylized with the Greek symbol Σ) is the only studio album by Japanese musical unit REOL. It was released on October 19, 2016 by Toy's Factory in two physical editions—a standard CD, and a CD and DVD bundle—and for digital consumption. Prior to their formation, each member—Reol, Giga and Okiku—worked with each other on numerous musical projects until finalizing a record contract with Toy's Factory in early 2016. The material on the album were written, sung and co-composed by Reol, while production was handled by all three artists and arranged by Giga.
Sigma is an electronic dance album that incorporates elements of hip-hop, contemporary pop and club sounds. Lyrically, the record delves into enjoyment, love, having fun and a variety of expressions, all encased by their current state of mind, as described by them as "transitory". Upon its release, Sigma received positive reviews from music critics. Several commentators complimented the group's musical direction, alongside Reol's vocals and commercial appeal.
Commercially, Sigma experienced moderate success in Japan, reaching the top ten on both the Oricon Albums Chart and Japan Hot Albums chart, the latter hosted by Billboard. In order to promote the album, the album tracks: "ChiruChiru", "Give Me a Break Stop Now", and "YoiYoi Kokon" were served as digital singles, accompanied with additional music videos co-created by Okiku. Furthermore, REOL had appeared on several promotional formats such as live performances, magazines and interviews on social media.