The musicians in the Temple were the slaves of the Levites, or perhaps from distinguished families, or perhaps Levites themselves. Is the focus of the singing in the Beit HaMikdash these instruments, or actual singing? This Gemara turns our understanding of the music in the Temple on its head. Also, the famous comparisons that praise the joy of the simchat beit hashoevah, the beauty of Jerusalem, and more. Plus the light that would come from the Temple, from the menorot there. Plus a description of the water libations. And Alexandria's shul. Also, the women at the Temple - how they organized who would be where, to establish the Ezrat Nashim.