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"Travels In Constants is a limited edition mailorder only CD series. The CDs are not available in stores, only by subscription, and all of them contain EXCLUSIVE, UNRELEASED songs. No lame alternate versions or low-grade out-takes. These are prime releases by amazing artists." Travels in Constants originally consisted of 23 releases issued by American record label , issued between 1999 and 2007. In 2015, volume 24 appeared. A large number of the artists involved had been signed to for releases outside of the series (Eluvium, Explosions in the Sky, Mono) whilst some hadn't had any other releases on the label (Mogwai, Songs: Ohia), and some artists on have not released anything for the series.