The "Pie Jesus" section of Gabriel Faure's Requiem is gorgeously sorrowful and a lovely selection for large church funerals. Requirements: one church organist with one heck of a soprano or a nice church sound system upon which to play a fine recording like this one.
Pie Jesu Domine, Dona eis requiem.
Dona eis requiem. Pie Jesu Domine,
Dona eis requiem sempiternam.
Translation: Merciful Lord Jesu, Give them rest. Give them rest. Merciful Lord Jesu, Give them everlasting rest.