All just my personal opinion
Bach, St.John Passion BWV 245, with the following artists: Harnoncourt / Equiluz (1965), Jochum / Haefliger (1967), Rotzsch / Schreier (1976), Koopman / de Mey (1993), Suzuki / Türk (1998), Gardiner / Padmore (2003), Layton / Bostridge (2012)
Music by Arvo Pärt: CD “Adam’s Lament” (Kaljuste), “Beatus” (Kaljuste), “Triodion” (Layton), “Da pacem” (Hillier); Henryk Mikołaj Górecki: Miserere op.44, Amen op.35 (Nelson)
Bach: Cantata BWV 140, “Wachet auf, ruft uns die Stimme” — Comparing 5 recordings: Leppard/English Chamber Orchestra, London Voices (1981), Harnoncourt/Concentus musicus (1984, partial), Gardiner/Monteverdi Choir/English Baroque Soloists (1992), Koopman/Amsterdam Baroque Orchestra & Choir (2006), Lutz/J.S.Bach-Stiftung St.Gallen (2008, DVD)
Schumann: Novelletten, op.21 — Richter; Myaskovsky: Cello Sonata Nr.1 in D, op.12 — Mørk/Thibaudet; Rachmaninoff: Vocalise from the 14 Songs, op.34 — Isserlis/Hough; Rachmaninoff: Cello Sonata in G minor, op.19 — Mørk/Thibaudet, Isserlis/Hough; Franck: Violin or Cello Sonata in A — Spivakov/Bezrodnyi, Perlman/Argerich, Isserlis/Hough