My siddur of choice is the סדור תפילת השלם but I am wondering about one bit of vocalization used therein. In the davening of shacharit for both weekdays and shabbat, there is a sentence before shma ...
In many Siddurim and Maḥzorim Adon 'Olam is printed at the end of Ma'ariv for Friday night and Yom Tov. But in my experience, the vast majority of (Ashkenazi) Shuls sing Yigdal at this point instead. ...
Who invented the meditation that is often printed before such things as counting the 'Omer, inviting the Ushpizin, and other Mitzvoth or Mitzvah-related activities, and what is the basis for it?