rega is an instrumental progressive band from Ehime Prefecture in western Japan — bright, guitar-led music that sits between math rock and post-rock, with no singing. Built around a constant core of guitar, bass and drums, the band has spent nearly two decades making its own precise, wordless records, largely unheard outside Japan.

The short version

Formed in the Ehime region in the mid-2000s, rega released its debut, Million, in 2009 and has recorded steadily since, moving from the Sophori Field Company label to WORDS Recordings. Discogs describes the group as a progressive jam band from Ehime and dates its formation to 2005; the year shown here follows the date used across this site. The music is instrumental throughout — there is no vocal language to state — and the band is thinly documented abroad, so this guide keeps to what the releases confirm.

An instrumental band from Ehime

The band is built on a constant trio: Ryuji Ide on guitar, Akinobu Aoki on bass and Takafumi Miyake on drums. Those three have played on every rega album. Around them the second-guitar seat has changed hands: Tetsuya Kato plays it on the 2009 debut, Akira Yotsumoto takes over from the second album and stays for roughly the next decade, and by the most recent record the band has dropped the second guitar altogether and become a trio. rega is Japanese, from Ehime on the island of Shikoku, and its music is instrumental — the single most important thing to understand about the band, because it means the guitars carry the melodic work a singer would do in another group.

A constant core, a changing second guitar

What the band does is instrumental progressive rock with a math-rock edge: compact, interlocking guitar figures, tight rhythmic turns, a clean and bright tone rather than a heavy one, and the elastic looseness of a group that plays off one another — the “jam band” quality Discogs notes. Across the catalogue the tracks tend to be short by progressive standards, most between three and five minutes, which keeps the records moving. This guide describes that method rather than characterising the finer texture of the sound, because to do the latter would mean claiming a listening it has not made; the facts — instrumentation, tracklists, personnel — are what it states with confidence.

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The Sophori years and the WORDS years

The catalogue divides cleanly by label. The early records — Million (2009), Lyrics (2010) and Solt & Plum (2012) — came out on Sophori Field Company and established the band’s two-guitar sound. After a five-year gap the band moved to WORDS Recordings, where the self-titled album of 2017 largely re-recorded and remixed the early repertoire rather than presenting new writing, and the trio album Backside of the Moon (2025) followed. The Sophori years and the WORDS years are the natural two halves of the story, split by the longest pause in the band’s run.

From four-piece to trio

The clearest line of change runs through the guitars. From a two-guitar four-piece on every album from 2009 to 2017, the band pared back to a three-piece — Ide, Aoki and Miyake — for the 2025 record, after Yotsumoto’s departure. That contraction is the single biggest shift in the band’s sound, because it took away the twin-guitar front line that had defined it for its whole career to that point. The music also stayed almost entirely instrumental across the change; the one documented exception in the whole catalogue is a single guest vocal on the newest album.

Album by album

Five studio albums between 2009 and 2025. Tap any title for its guide.

Who plays, and what is not here

A note on scope and personnel. Discogs credits rega with eight albums in all, along with singles, EPs and other appearances; the five studio records covered here are the core of that output rather than the complete discography. The constant members are Ide, Aoki and Miyake; the second-guitar chair was held by Kato on the debut and by Yotsumoto from 2010 through 2017, and stands empty on the trio record. Where specific per-track detail or durations are not on the release pages, this guide says so rather than guessing — the honest position for a band this thinly documented abroad.

Where to start

Start with Million (2009), the debut, the source of much of the band’s recurring repertoire and the clearest statement of its bright, instrumental sound. Then Lyrics (2010) and Solt & Plum (2012) for the settled four-piece. Come to the self-titled album (2017) knowing it revisits the early songs, and to Backside of the Moon (2025) to hear the band reduced to a trio — and note that ‘Lightyards’ is a track on that record, not an album of its own.

Why they still matter

rega matter as a clean example of the deep, self-sufficient instrumental underground that Japanese progressive and math rock runs on: a band from a small region, releasing its own precise, wordless records for the best part of twenty years, with a stable core and no interest in singing or in a wider spotlight. It will not trouble a chart or a major magazine, and it has kept making its interlocking, guitar-led instrumental music regardless. For listeners drawn to the melodic, math-rock end of instrumental progressive rock, the catalogue is a real and largely undiscovered find.

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