Q: #504. How many times does the New Testament mention singing?
A: I find 11 verses that mention singing in the New Testament.
(Mt 26:30) And when they had sung an hymn, they went out into the mount of Olives. (Also see: Mk 14:26)
(Acts 16:25) And at midnight Paul and Silas prayed, and sang praises unto God: and the prisoners heard them.
(Rom 15:9) And that the Gentiles might glorify God for his mercy; as it is written, For this cause I will confess to thee among the Gentiles, and sing unto thy name.
(1 Cor 14:15) What is it then? I will pray with the spirit, and I will pray with the understanding also: I will sing with the spirit, and I will sing with the understanding also.
(Eph 5:19) Speaking to yourselves in psalms and hymns and spiritual songs, singing and making melody in your heart to the Lord;
(Col 3:16) Let the word of Christ dwell in you richly in all wisdom; teaching and admonishing one another in psalms and hymns and spiritual songs, singing with grace in your hearts to the Lord.
(Heb 2:12) Saying, I will declare thy name unto my brethren, in the midst of the church will I sing praise unto thee.
(James 5:13) Is any among you afflicted? let him pray. Is any merry? let him sing psalms.
(Rev 5:9) And they sung a new song, saying, Thou art worthy to take the book, and to open the seals thereof: for thou wast slain, and hast redeemed us to God by thy blood out of every kindred, and tongue, and people, and nation;
(Rev 14:3) And they sung as it were a new song before the throne, and before the four beasts, and the elders: and no man could learn that song but the hundred and forty and four thousand, which were redeemed from the earth.
(Rev 15:3) And they sing the song of Moses the servant of God, and the song of the Lamb, saying, Great and marvellous are thy works, Lord God Almighty; just and true are thy ways, thou King of saints.
If you add in the Old Testament, there are approximately 186 more verses that mention singing (or singers).