Hi Folks
Just a warning (unless I misunderstand)
I loaded a presentation with six hymns all on a black background.
I selected all six hymns and went to the medial browser and selected a set (Advent Peace) and the hymn slide form that.
I looked the available options - 'Add to current item seemed the closest to what I wanted. It stuck a blank song slide in my order.
Nothing daunted I reselected all my hymns and went to backgrounds on the main screen and found the background I had chosen previously amongst those offered, clicked on it, and all my hymns were nicely updated.
I right clicked on the hymn that was blank and selected delete -all my hymns disappeared and undo failed to restore them.
Yes I should have noticed that the whole lot were still highlighted and cleared the selection.
This post is written so that you too may have all joy and not be caught out as I was.