Omnivore Recordings this spring will finish its Game Theory reissue campaign by releasing a new collection of almost entirely unreleased material recorded by the jangle-pop outfit’s final lineup in 1989 and 1990, when late frontman Scott Miller brought on board Michael Quercio of the recently broken-up The Three O’Clock.

The Three O’Clock will celebrate their current reunion with a brand-new compilation album this summer — The Hidden World Revealed, featuring 10 previously unreleased tracks — and with a performance on “Conan” tonight ahead of the band’s appearances at the Coachella Valley Music & Arts Festival.

Paisley Underground standard-bearers The Three O’Clock will prepare for their Coachella Valley Music & Arts Festival reunion this April with a far more intimate warm-up gig in Pomona, Calif. — part of the mammoth music fest’s slate Los Angeles-area concerts taking place before and between the event’s twin weekends.