The Watchtower 1970 4/1 emphasis the principle that singing at the Kingdom Hall is part of worship to God and is one of the most beautiful ways they can show this worship to him.
of all the ways in which we can worship and praise Jehovah God—by prayer, by public talks, by our field ministry and by our exemplary conduct—one of the most beautiful of them is this literal singing of songs to Jehovah’s praise....And, above all, let us pay more than usual attention to the words. It is by the words that we worship Jehovah God, bringing praise to Him
As an introduction to Song 146, JW org states -
Jesus considers any act of love and support for his anointed brothers as though it were done for him
Other sheep Jesus has, and they serve alongside
those anointed to be Christ’s heavenly bride.
All the things that are done
for their comfort and aid
are things he considers that must be repaid.
(CHORUS)
“If you comforted them, you comforted me.
If you did it for them, you did it for me.
Your labors for them were your labors for me.
You did it for them; you did it for me.
If you did it for them, you did it for me.”
“Yes, you comforted me in my hunger and thirst,
and whatever my need, you came to me first.”
“Tell us, when did we do this?”
these ones will reply.
The King will then answer them, telling them why:
(CHORUS)
“You’ve been loyal to me, doing works that are fine,
as you preach alongside these brothers of mine.”
So the King will then say
to the sheep on his right:
“Inherit the earth and perfection of life.”
(CHORUS)
(See also Prov. 19:17; Matt. 10:40-42; 2 Tim. 1:16, 17.)
As if it is not enough that they are singing songs of praise to the Governing Body, the first part of the song is a claim by them that works and aid are actually owed to them. They use the phrase that these things must be 'repaid'.