Poetry sung to the praise of God and for the mutual encouragement of believers. Hymns and songs are not clearly distinguished in Scripture, but the NT contains examples of possible early Christian hymns.
Christians are to sing hymns together for mutual encouragement
1 Corinthians 14:26See alsoEphesians 5:19;
Colossians 3:16“Psalms” refers to the OT psalms (see Lk 20:42; 24:44; Ac 1:20; 13:33) some of which may have been set to music by Christians. “Psalm” could also describe a song newly composed for Christian worship (see 1Co 14:26 where “hymn” translates Greek “psalmos”).