SUMARIO. House sound : reverb, offscreen sound, and voice-over narration in early RKO noir / Sonic effects : sound and fury in Forties noir / Audio technologies : intercoms and dictaphones, telephones and radios, phonographs and jukeboxes / Blues in the night : popular and classical instrumental source music / Singing detectives and bluesmen, black jazzwomen and torch singers / The big number (side b) : killing them softly / The big number (a side) : siren city.