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It’s a hard truth: Some Eastern European avant-garde jazz vocalists sound like Cuisinarts undergoing nervous breakdowns. Czech singer Jana Koubkovà isn’t one of themher music is surprisingly accessible and enjoyable. On the sole CD of her work that I have been able to obtain, she wittily employs her crystalline, wide-ranging voice, often overdubbed, to explore wordless rhythmic and harmonic patterns. According to the Czech Embassy’s press release, Koubkovà is “comfortable dwelling in blues, swing, mainstream, Latin, jazzrock, minimalist, free form, and moreall with an intensity of elegant rhythm and grace.” Jazz buffs underwhelmed by the retro stylings of Diana Krall and Harry Connick Jr. are advised to drop by the Iota Club and Cafe for a preview of what could be the next dimension of vocal jazz. Also performing tonight are Josh Rouse and the Cravin’ Dogs. The show starts at 8 p.m.at IOTA, 2832 Wilson Blvd., Arlington. $7. (703) 522-8340. (JES)