Proverbs 25:20 (ESV)
20 Whoever sings songs to a heavy heart
is like one who takes off a garment on a cold day,
and like vinegar on soda.
Proverbs 11:9-11 (ESV)
9 With his mouth the godless man would destroy his neighbor,
but by knowledge the righteous are delivered.
10 When it goes well with the righteous, the city rejoices,
and when the wicked perish there are shouts of gladness.
11 By the blessing of the upright a city is exalted,
but by the mouth of the wicked it is overthrown.
Ephesians 5:18-21 (ESV)
18 And do not get drunk with wine, for that is debauchery, but be filled with the Spirit, 19 addressing one another in psalms and hymns and spiritual songs, singing and making melody to the Lord with your heart, 20 giving thanks always and for everything to God the Father in the name of our Lord Jesus Christ, 21 submitting to one another out of reverence for Christ.