Vocal score:

Code k (008/20 and 006/03 - MU) indicates a score showing all vocal parts, solo and/or choral, with the instrumental accompaniment either arranged for keyboard(s) or other chordal instrument(s) or omitted.

Note:  See code h (Chorus score) for scores of works for solo voices and chorus that include only chorus parts.  See code p (Piano score) for reductions of vocal works that do not include the vocal line(s).