I asked why specifically after the miracle of "Krias Yam Suf" did Klal Yisrael say Shira. It was pointed out as well that shira was said after the miracle of Nachal Arnon. There, an answer was ...
We insert Al Hanisim on Purim and Channukah and that's fine -- each holiday is marked by a miracle. But why is its use limited to those days? Why don't we add it in to bentching and davening on Pesach ...