For all my carping at this book’s misplaced emphasis on very traditional material, it does cover the liturgical bases.
This song is for the blessing of the palms and has an antiphon from the Roman Missal based on Matt 21:9 and verses from Psalm 118 from The Grail.
On this page CWB II gives suggestions for songs for the procession and Mass on Passion Sunday.
I can’t get BIAB to do chant so I am no help to anyone. For my own amusement, as I once again failed, I laid on some sounds that don’t help.