Half-Torah/הַפְטָרָה - Shvi'i Shel Pesach: Is this Just Another Song? (Shmuel Beis 22:1-51) 🎶

On the 7th day of Pesach, we re-read the story of Krias Yam Suf and Shiras HaYam. But, this time, we follow up with a different Haftarah, NOT Shiras Devorah, but Shiras Dovid. The question is why not use the same Haftarah for both Beshalach and Pesach? Because we don't want to repeat a Haftarah? But, we will be doing just that when we read Shiras Dovid again as the Haftarah for Parshas Ha'azinu! So, hy is Shiras Dovid appropriate for Pesach?