Why is the book Song of Songs read at the Passover?
There are two answers that I know: 1. The Song Of Songs mentions the spring, Passover is the beginning of the spring. Another name For Passover is "Chag Ha'aviv"- "The Spring Holiday". 2. The Song Of Songs talks about Hashem choosing the jewish nation and his love to us. That is what Passover is all about. (source- "Sefer Hatoda'ah"). Rabbi Yitzchak Grinblat.