The next new resource for the new Song Book is the "Song Book Harmony". This lists all of the songs published in the 2015, 1987 and 1953 editions of the Tune Book, including supplements, showing the song numbers in each edition. This data was the basis for the Comparison Charts for the Song Book that were published a few days ago.
A companion Tune Book Harmony was published last week. Online versions of both are in development. Printable (MS Word and PDF) versions will be published first.