This Shabbat was Shabbat Shirah.

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From Chabad.org:

Shabbat of Song    

This week's Torah reading contains the "song at the sea" sung by the Children of Israel upon their deliverance from the Egyptians, when the Red Sea split to allow them to pass and then drowned their pursuers. Hence this Shabbat is designated as Shabbat Shirah, "Shabbat of song."

Our sages tell us that the birds in the sky joined our ancestors in their singing; for this reason it is customary to put out food for the birds for this Shabbat (to avoid the possibility of transgressing the laws of Shabbat, the food should be put out before Shabbat).