I just added this hymnal yesterday, and when I search "Harmonia Sacra" it shows up, but when I click on the link it says it doesn't exist. It also shows a little "in my hymnals" emblem but is not listed in My Hymnals. I have the book in front of me as I type, and I bought it from Christian Light Publishers in the last month, so it's not like it's a figment of my imagination, nor is it a private publication that someone thinks is beneath Hymnary. I suppose I can try to add it again and see if it stays in this time. This time I'll call it 2010 not 1980, as on close inspection it does say it is "Revised Edition 2010", and bears a 2010 © date.