In paradisum

"In paradisum" (English: "Into paradise") is an antiphon from the traditional Latin liturgy of the Western Church Requiem Mass. It is sung by the choir as the body is being taken out of the church. The text of the "In paradisum" — with or without the Gregorian melody itself — is sometimes included in musical settings of the Requiem Mass,
such as those by Gabriel Fauré and by Maurice Duruflé.
Text.
In the Masses for the dead, this antiphon is sung in procession on the way from the final blessing of the corpse in church to the graveyard where burial takes place. The Gregorian melody for "In paradisum" is in the Mixolydian mode. The special nature of this mode — with its lowered seventh degree, which makes it different from the modern major mode — is heard twice in this melody at cadences on the words "Chorus Angelorum" and "quondam paupere". The melodic highpoint in this setting comes on the name of Lazarus, the poor beggar in Luke's Gospel.
Modern variations.
There are many contemporary English settings of the text, offered by Catholic publishers including Oregon Catholic Press. Bob Dufford wrote a version called "Songs of the Angels". James Quinn also wrote a version titled "May Flights of Angels Lead You On Your Way", accompanied by "Unde et Memores". Others include settings by Grayson Warren Brown, Ernest Sands, and others.
In Paradisum served as the inspiration for popular Gospel-turned-jazz piece "When the Saints Go Marching In", which share the same first four notes, similar textual meaning, and use during the funeral procession of the body from the church to the cemetery.