Here are some verses I found that command us to sing.
1. Exodus 15:21
And Miriam sang to them: “Sing to the Lord, for he has triumphed gloriously; the horse and his rider he has thrown into the sea.â€
2. 1 Chronicles 16:9
Sing to him, sing praises to him;Â tell of all his wondrous works!
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3. 1 Chronicles 16:23
Sing to the Lord, all the earth! Tell of his salvation from day to day.
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4. 2 Chronicles 20:21
And when he had taken counsel with the people, he appointed those who were to sing to the Lord and praise him in holy attire, as they went before the army, and say, “Give thanks to the Lord, for his steadfast love endures forever.â€
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5. 2 Chronicles 29:30
And Hezekiah the king and the officials commanded the Levites to sing praises to the Lord with the words of David and of Asaph the seer. And they sang praises with gladness, and they bowed down and worshiped.
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6. Psalm 9:11
Sing praises to the Lord, who sits enthroned in Zion! Tell among the peoples his deeds!
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7. Psalm 30:4
Sing praises to the Lord, O you his saints, and give thanks to his holy name.
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8. Psalm 33:3
Sing to him a new song; play skillfully on the strings, with loud shouts.
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9. Psalm 47:6
Sing praises to God, sing praises! Sing praises to our King, sing praises!
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10. Psalm 47:7
For God is the King of all the earth; sing praises with a psalm!
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11. Psalm 66:2
sing the glory of his name;Â give to him glorious praise!
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12. Psalm 68:4
Sing to God, sing praises to his name;
 lift up a song to him who rides through the deserts;
 his name is the Lord; exult before him!
13. Psalm 68:32
O kingdoms of the earth, sing to God; sing praises to the Lord, Selah
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14. Psalm 81:1
Sing aloud to God our strength;Â shout for joy to the God of Jacob!
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15. Psalm 96:1
Oh sing to the Lord a new song; sing to the Lord, all the earth!
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16. Psalm 96:2
Sing to the Lord, bless his name; tell of his salvation from day to day.
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17. Psalm 98:1
Oh sing to the Lord a new song,
 for he has done marvelous things! 
His right hand and his holy arm have worked salvation for him.
18. Psalm 98:4
Make a joyful noise to the Lord, all the earth; break forth into joyous song and sing praises!
19. Psalm 98:5
Sing praises to the Lord with the lyre, with the lyre and the sound of melody!
20. Psalm 105:2
Sing to him, sing praises to him; tell of all his wondrous works!
21. Psalm 135:3
Praise the Lord, for the Lord is good; sing to his name, for it is pleasant!
22. Psalm 147:7
Sing to the Lord with thanksgiving; make melody to our God on the lyre!
23. Psalm 149:1
Praise the Lord!
 Sing to the Lord a new song, his praise in the assembly of the godly!
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24. Isaiah 12:5-6
“Sing praises to the Lord, for he has done gloriously; let this be made known in all the earth. Shout, and sing for joy, O inhabitant of Zion, for great in your midst is the Holy One of Israel.â€
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25. Isaiah 42:10-12
Sing to the Lord a new song,
 his praise from the end of the earth, 
you who go down to the sea, and all that fills it,
 the coastlands and their inhabitants. Let the desert and its cities lift up their voice,
 the villages that Kedar inhabits; 
let the habitants of Sela sing for joy,
 let them shout from the top of the mountains. Let them give glory to the Lord, and declare his praise in the coastlands.
26. Isaiah 52:9
Break forth together into singing,
 you waste places of Jerusalem,
 for the Lord has comforted his people; he has redeemed Jerusalem.
27. Jeremiah 20:13
Sing to the Lord;
 praise the Lord!
 For he has delivered the life of the needy from the hand of evildoers.
28. Jeremiah 31:7
For thus says the Lord:
 “Sing aloud with gladness for Jacob,
 and raise shouts for the chief of the nations; 
proclaim, give praise, and say,
 ‘O Lord, save your people, the remnant of Israel.’
29. Zephaniah 3:14
Sing aloud, O daughter of Zion;
 shout, O Israel!
 Rejoice and exult with all your heart, O daughter of Jerusalem!
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30. Zechariah 2:10
Sing and rejoice, O daughter of Zion, for behold, I come and I will dwell in your midst, declares the Lord.
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31. Colossians 3:16
Let the word of Christ dwell in you richly, teaching and admonishing one another in all wisdom, singing psalms and hymns and spiritual songs, with thankfulness in your hearts to God.
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