You can search for anthems by both the Revised Common Lectionary and the Roman Lectionary by using our Liturgical Calendar Search on our Worship Planning page. Enter which lectionary and year you prefer (A, B, or C). Each year is labeled by date within the calendar. The appointed readings for that Sunday will be listed with Editors' Choice anthem suggestions that fit that reading.
Visit Worship Planning: https://www.jwpepper.com/sheet-music/services-worship-planning.jsp
You will be asked to select a calendar, year, and season. After clicking "Search," you will be presented with a list of Sundays.