Since you are interested in 20th-century Chamber Music (recorded 1956 - 1971), here is a list of other items that you may find interesting.
BENJAMIN BRITTEN
Rarities (incls 'Voices for Today' & 'Bottom's Dream') Choir of King's College / John Hahessy (boy alto) / Peter Pears (tenor) / Pamela Bowden (contralto) / Sir Geraint Evans (baritone) [ Decca SBS Australian Eloquence / CD - released 1/Jan/2013 ] "Britten's underrated United Nations anthem Voices for Today makes it onto disc at last, together with vintage recordings of artists the composer chose to work with." (BBC Music) |
WILLIAM WALTON
Facade / Siesta / Scapino Overture / Portsmouth Point Overture (with music by Bax & Bliss) Dame Edith Sitwell and Sir Peter Pears (narrators), English Opera Group Ensemble, Anthony Collins / London Philharmonic Orchestra, Sir Adrian Boult [ Decca Australian Eloquence / CD - released 10/Nov/2010 ] "As for the performance, it stands above all others since … must remain a classic to the end of time" Gramophone Magazine |
BELA BARTOK
Bartok: Concerto for Orchestra / Viola Concerto Daniel Benyamini (viola) / Boston Symphony / Orchestre de Paris [ SBS Deutsche Grammophon Eloquence / CD - released 1/Apr/2010 ] 'the committed performance here by soloist and conductor shows the concerto in the best possible light; and the slow movement is really touching' Gramophone [Viola Concerto] |
SCHUBERT
Rosamunde (complete incidental music) Rohanzig Yachmi (contralto) / Vienna State Opera Chorus / Vienna Philharmonic Orchestra, Karl Munchinger [ Decca SBS Australian Eloquence / CD - released 20/Feb/2011 ] "glows with an affectionate warmth... one of Munchinger's very best records... the VPO is at its magnificent best" (Penguin Guide) |
SPOHR
Spohr - Piano Quintet, Double Quartet, Octet & Nonet (recorded 1959 - 1969) Vienna Octet, with Walter Panhofer (piano) [ Decca Australian Eloquence / 2 CD - released 20/Oct/2010 ] "The players sound as if they know [the Spohr Octet] inside out; the interpretation has matured, gaining in precision and also in insouciance" Gramophone |