Steven Duckworth has arranged the folk tune 'Black is the Colour (of My True Love's Hair)' into an interesting a cappella arrangement for an SATB and for SSAA group. 
 
Mixed Voices:
Range: Soprano: B3 - E5 • Alto: A3 - B4 • Tenor: E3 - F# 4 • Bass: A2 - C4
Difficulty: Hard
Voicing: SATB
Recording: https://youtu.be/5u0auBuqcTk
 
ISMN: 9790900252692
 
Upper Voices:
Range: Soprano 1: C4 - F5 • Soprano 2: C4 - F5 • Alto 1: Bb3 - Ab4 • Alto 2: G3 - G4
Difficulty: Hard
Voicing: SSAA
Recording: https://youtu.be/pu1CCA42lL8
 
ISMN: 9790900252685