Broadcast's and Atlas Sound's latest albums both explore what critic Simon Reynolds, borrowing from Derrida, has dubbed "hauntology" in music: "the paradoxical state of the spectre, which is neither being nor non-being." In general, this means lots of disembodied voices, echoes, blurs, and hazes of sound, and a kind of sinister nostalgia or longing. Broadcast plies heavy-lidded, vintage psychedelia that plays out like the faded but color-saturated film stock of some old Italo horror flick. Atlas Sound makes soft, breezy bedroom-pop with a troubled past. Both are teeming with ghosts. (Neumos, 925 E Pike St, 709-9467. 8 pm, $13.50, 21+.)