about what drops when in the observance of Prelent and Lent. So, here're the modifications to the Divine Service as given in Lutheran Service Book for the one year series:
From Septuagesima onward: the Alleluia is replaced by the Tract.
From Ash Wednesday onward: the Gloria in Excelsis is omitted.
From Judica onward: the Gloria Patri is omitted from the Introit.
Additionally, LSB prescribes the Epiphany preface for Septuagesima, Sexagesima, and Quinquagesima; and it assigns these Sundays the color green. Ash Wednesday through Judica uses the Lenten Preface - and Ash Wednesday is either violet or black; the rest of Lent to Holy Week is violet. Holy Week has its own preface (the old Lenten Preface, actually) and may either remain violet, or be scarlet throughout, although white may be used on Maundy Thursday and black (or nothing) on Good Friday.
Though not prescribed in LSB, St. Paul's has observed for a number of years the practice of using the Baptismal Creed - the Apostles' - during Advent and Lent.