Matthew 26:30
And after they had sung a hymn, they went up to the Mount of Olives. [Note: This was a small hill just east of Jerusalem]
Ephesians 5:19
Speak to one another by using psalms, hymns and spiritual songs, singing and making music with your hearts to the Lord.
Colossians 3:16
You should let the message of Christ live in you abundantly [i.e., as individuals and collectively]. Use [much] wisdom in teaching and warning one another with psalms, hymns and spiritual songs, singing with favor [i.e., with thankfulness] in your hearts toward God.
James 5:13
Is there anyone among you who is suffering? [If so], he should pray. Is anyone happy? [Then] he should sing a psalm.