Disk in audioacoustics paper cover. [a] Cage: Construction in Metal [First Construction (In Metal), 1939] 16" NORTHERN RADIO COMPANY 33 1/3 RPM. center->edge (recording pattern), 1 Track. [b] Dirge (label partly missing, no composer's name) center->edge (recording pattern), 1 Track. This is likely a composition by Mildred Couper, titled Dirge, and listed in David Revill's book The Roaring Silence (p. 67): a work for two pianos tuned a quarter-tone apart, performed at the Cornish Theatre on 9 Dec. 1939, the same day as Cage's Construction in Metal.