Sample 2: An American pupil of Nadia Boulanger?
No comment from me (wrong thread) -- but I will venture it's a good guess.
Could have been written by Alexander, Allanbrook, Amlin, Anderson, Bassett, Bauer, Bearer, Bennett, Berger, Berlinski, Blackwood, Blitzstein, Bowles, Briggs Sadovnikoff, Brunswick, Carter, Chanler, Chihara, Chowning, Citkowitz, Clarke, Cole, Conte, Cooper, Copland, Crawford, Creshevsky, Cunningham Sumner, Cushing, Dahl, Delaney, Des Marais, Dett, Diamond, di Bonaventura, Drauglelis, Duke, Effinger, Elwell, Erb, Ericourt, Ermili, Fine, Finney, Fischer, Fisk, Frackenpohl, Friedhofer, Gage, Galkin, George, Gittleman, Glanville-Hicks, Glass, Goeb, Goldman, Gottlieb, Grantham, Grouya, Haieff, Hailstork, Hammond, Harris, Howe, Husa, Imbrie, Jones, Kanach, Kerr, Kimball, Kozinski, Kraft, Krzywicki, Kubik, Kuney, Labunski, La Montaine, Lee, Lehrman, Lessard, Lewis, Lockwood, Lybbert, Maganini, Manziarly, Mekeel, Middleton, Mikhashoff, Moevs, Montgomery, Moore, Moore, Moscatelli, Musgrave, Pasatieri, Peaslee, Perry, Pinkham, Piston, Ptaszynska, Robb, Robertson, Rodriguez, Rogers, Rolin, Sapp, Shafer, Shapero, Shapiro, Shen, Siegmeister, Skrowaczewski, Smith, Smith, Spies, Stringfield, Strouse, Suesse, Swanson, Talma, Tcherepnin, Thomson, Tingley, Toth, Trimble, Viens, Vincent, Vosgerschian, Wagner, Walker, Walters, Ward-Steinman, Warren, Washburn, Wilkins, or Woollen