I can't say I care for any of the 135 latest songs. Some are technically well done, but I don't find any of them inspiring.
In the old days, some of the songs were very hymn-like, seemingly familiar to the ex-Protestant (non-Catholic) population of the US, which is the background from which the JW religion came from. The wording from the songbook I grew up using contained hymns with a lot of King James-isms, 'wise and meet', 'Calvary', etc. Plus the authorship of the tunes was either unknown or were very similar to existing hymns.
In the US in recent years the copyright companies have become very aggressive, and in some cases demand royalties. I know of several churches in my area that have to pay annual royalties to use their own hymnbook. I suspect the WT's rewrite of their songs is partly due to this.