I'm a bit surprised not to see TEMPUS ADEST FLORIDUM ("Spring Has Now Unwrapped Her Flowers" here. This is the original song to the tune now best known as "Good King Wenceslas". It's a May Day flower carol. Here's a link to a fasola shapenote score of one verse in Latin and three in English from my under-construction "Shape Note Daily Lectionary Hymnal".

Haruo

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The "Original" song with Lyrics circa 13th Century on YouTube     https://www.youtube.com/watch?v=zv8PgukSLX0
Many other recordings on YouTube   https://www.youtube.com/results?search_query=Tempus+Adest+Floridum