Hymns

Psalms 81
1 Sing aloud unto God our strength: make a joyful noise unto the God of Jacob.
2 Take a psalm, and bring hither the timbrel, the pleasant harp with the psaltery.
3 Blow up the trumpet in the new moon, in the time appointed, on our solemn feast day.
4 For this was a statute for Israel, and a law of the God of Jacob.

God loves our gospel music. It's the law. I think maybe this passage refers to worship - not specifically hymns.