This song is based from the Bible (Habakkuk 3:17-19a). Habakkuk determines to rejoice greatly, not in his situation, but in God. For his strength is not in his circumstances, which may happen to look bad, but his strength is in God.
“Rejoice!” in SATB (Soprano, Alto, Tenor, Bass) mostly has the lower voices to sing the same part. All parts are written as a piano score. “Rejoice!” is composed in a minor key (C minor) and is to reflect the claiming of victory despite hardship. The staccato notes are to help express the rejoicing element. If omitting the repeat sign, “Rejoice!” is 28 measures long.