Like every Shabbos, Yom Tov, and Rosh Chodesh, we include Mussaf in our morning prayers. Mussaf takes more time than Shacharis because it includes more Piyutim, as well as the remaining seventy Shofar blasts. The Chazzan for Mussaf is typically not the same as the Chazzan for Shacharis, but the tune remains the same. One thing unique to this Mussaf prayer is that it is the longest Shmone Esrai of the year.
Malchiyos, Zichronos , Shofros – Much of the theme of the Mussaf prayer revolves around the three main concepts of the day – Kingship, Remembrances, and Shofar blasts. Not only do we read verses that highlight these themes, we also offer up prayers to G-d on these topics. We pray that His kingship be recognized by all humanity, that He remember us for the good, and that the great shofar that will herald in the coming of the Moshiach finally ring.
Shofar Blowing – At different times throughout Mussaf the Tokea heads to the Bima and blows various sets of blasts. In the Nusach Ashkinaz custom, the shofar is not blown during the silent Shmone Esrai. Rather, it is sounded during the Chazzan’s repetition, and at the end of Mussaf. In Nusach Sfard, the blowing is done during the silent Shmone Esrai. Regardless, the shofar will be blown again after Mussaf to complete one hundred blasts. One may not talk from the time that the blessing is made before the sounding of the Shofar, until all blasts are completed after Musssaf.