Ha’azinu is not always read; every third year or so, it comes out on Shabbat Shuva, and that Haftarah is read instead.
But when it is its own Shabbat, sometime during the Tishrei holiday season, then we read David’s poem from Shmuel II, which parallels Moshe’s poem of He’ezinu
Linear annotated translation of the Haftarah of Ha’azinu
Among the parallels is the importance placed on the quality called Tamim