Show Key name and first note of song?

[David F.]

I have a hymnal that prints the name of the key and the first note the song 
above the treble clef sign of the first staff.  So, for example, if you have 
Amazing Grace in the key of G major, the first note of the soprano (melody) 
part is a D.  That is printed as “G/D”.

Can lilypond do that?  I thought I had seen an example of that somewhere, but I 
can’t find it now.

Thanks!
David