Quadruple chant for Psalms 12 or 13 in C minor (ATBB) or E minor (SATB)

Several versions of this quadruple chant are known. Three are found in the Cambridge University Library archive: 

• The earliest version (1970) is the quadruple chant for Psalm 12. ATBB & organ in C minor.
• Then we have quadruple chant for Psalm 12. SATB & organ in E minor, Chant 12b from the 1970s/80s Caius Psalter in E flat minor for SATB*, and the version for Psalm 13 for SATB & organ in E flat minor. The SATB versions might be assumed to date from the period 1982-1989 when the Gonville & Caius College Choir added a soprano line.