In the late '50s, Sun Ra emerged from big band to modern/progressive big band status, began to employ electronics, and used a more Afro-Centric percussive focus. This recording perfecly demonstrates those qualities, and more. There are several definitive themes from The Arkestra included, such as "Plutonian Nights," "Nubia," "Africa," "Watusa" and "Aethiopia." Dig for this one on vinyl from the Impulse LP reissue if you can (the cover art is stunning,) but it is nigh impossible to find on Saturn Research. If not, the Evidence CD combined with "Angels & Demons At Play" (containing the original graphics) will suffice.