Practice list (just focus on the melodies unless you are confident singing another part without practice):
Alleluia/Bridegroom Troparion
Thy Bridal Chamber (same melody as the Troparion)
We use these melodies throughout the first few days of Holy Week (the services on Sunday, Monday and Tuesday evenings - this year we're missing the Sunday evening service due to reader staffing). We won't sing it quite as slowly as at the YouTube link, and will pitch it at a higher octave for women's voices (sopranos, ignore the higher descant at the end, we'll just sing the melody). This version is also slightly different but it'll give you the general idea.
UPDATE FOR 2025: Please find below the page number sheet, which goes with the purple Holy Week Vol 1. A pdf of the book can be found here.