Hosanna, Filio David!

Here's Giovanni Vianini singing the Palm Sunday antiphon sung at the opening of the service:



Here's the whole Schola Mediolanensis singing the antiphon:



Here is the chant score:

In English:

Hosanna to the Son of David;
Blessed is he who comes in the name of the Lord.
King of Israel:
Hosanna in the highest.

Here's Thomas Weelkes' polyphonic version, from sometime around 1600:



Orlando Gibbons wrote a setting, too - a lovely one, in English:



Here's Pietro Lorenzetti's beautiful "Christ's Entry into Jerusalem":