Verses with the word singing in the Apocrypha (4 verses):

1 Esdras 5:42
Their menservants and handmaids were seven thousand three hundred forty and seven: the singing men and singing women, two hundred forty and five:

1 Esdras 5:60
Singing songs of thanksgiving, and praising the Lord, according as David the king of Israel had ordained.

1 Esdras 5:62
And all the people sounded trumpets, and shouted with a loud voice, singing songs of thanksgiving unto the Lord for the rearing up of the house of the Lord.

Wisdom of Solomon 18:9
For the righteous children of good men did sacrifice secretly, and with one consent made a holy law, that the saints should be like partakers of the same good and evil, the fathers now singing out the songs of praise.