This is an organ arrangement of "Salve Mater Misericordiae" by @laputis. The Latin hymn was composed in the 11th century and is associated with the Carmelite Order. It highlights Mary's role as Mother, Mediatrix, and Co-Redemptrix, emphasising her compassion, mercy, and grace. The score is available for immediate download below.
Score: https://www.sheetmusicplus.com/en/product/salve-mater-misericordiae-op-19-organ-solo-by-ausra-motuzaite-pinkeviciene-22736390.html?aff_id=478282
Organ specification: https://www.ohta.org.au/organs/organs/AlburyStMatts.html