When is the Musaf said? I know it is part of the Shacharit service. I mean when as in what holidays, fast days, etc... Would you say it on Tisha B'av for example. If not, why?
At the end of the Torah reading of Pinchas, we read about the additional sacrifices that were offered in the Temple on special days. These additional sacrifices are called musaf (in the singular) or musafin (in the plural), meaning "additions," and they were offered on Shabbat, Rosh Chodesh, Passover, Shavuot, Rosh Hashanah, Yom Kippur, and Sukkot, as well as on the intermediate days (Chol Hamoed) of Passover and Sukkot.
Are the holidays listed the only times you would do musaf?