Gregorian Chant – The Introit Gaudeamus omnes, scripted in square notation in the 14th—15th century Graduale Aboense, honors Henry, patron saint of Finland.

Gregorian Chant - The Introit Gaudeamus omnes, scripted in square notation in the 14th—15th century Graduale Aboense, honors Henry, patron saint of Finland.

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