The earliest siddur I own (London, 5569 [18808-09]) does not include Ketoret or Akeidah, despite purporting to follow the customs of the "German and Polish" communities [emphasis mine]. Since most of ...
Many have a custom not to say the Shir Shel Yom or Ein Kelokeinu on Tisha BeAv morning. Why not?
Sidurim (such as Rav Yaakov Emden's, but also modern nusach S'farad ones like ArtScroll's and T'filas Kol Pe) include a short prayer after various of the paragraphs of "Ezehu m'koman" asking God to ...