CAPTIVITY is a traditional Latvian folk tune; it is also known as KAS DZIEDAJA from the Latvian poem associated with the tune. The title CAPTIVITY is derived from its more recent use (especially in post-Vatican II Roman Catholicism) with Ewald Bash's paraphrase of Psalm 137, which begins "By the Babylonian rivers."

CAPTIVITY is a rather reflective tune, almost haunting in its minor mode. It has a stunning octave rise at the beginning of the second long line. The tune is suitable for either unison or part singing. Accompany with modest organ tones or strings (guitars).

--Psalter Hymnal Handbook