Speaking of high-church Anglicanism, parishioners at St. Ignatius of Antioch Episcopal Church on Manhattan’s Upper West Side were preparing for their Palm Sunday procession at 11 a.m. — with Gregorian plainchant and a Renaissance motet by Tomás Luis de Victoria — when they heard another procession outside. Another local church — I don’t know which denomination; there are Baptists, Methodists, and others nearby — was marching in the street, with a rollicking rendition of “When the Saints Go Marchin’ In.” Between them, the churches contributed some beautiful melodies to — to borrow an ancient movie title — the symphony of a great city.