Tantum ergo

Theological aspects

The words "procedenti ab utroque / compar sit laudatio"—literally, "May equal praise be to the One proceeding from both"—refer to the Holy Spirit, who according to the later version of the Nicene Creed used in Western Christianity proceeds from both the Father and the Son. The view that the Spirit proceeds from the Son as well is disputed by many Eastern Christians.
A partial indulgence is granted to the faithful who devoutly recite the Tantum ergo. But a plenary indulgence is granted on Holy Thursday and on the feast of Corpus Christi, if it is recited in a solemn manner.

Musical settings

The basic text has been set by numerous composers from the Renaissance (Palestrina), the Romantic period (Anton Bruckner, Gabriel Fauré, Franz Schubert, Louis Vierne), and modern composers (Maurice Duruflé, David Conte).
Déodat de Séverac composed a motet set to the text.
Bruckner wrote eight settings of the text: WAB 32, WAB 43, WAB 41 (Nos. 1, 2, 3, 4), WAB 42, and WAB 44. Fauré wrote two settings: Op. 55, and Op. 62 No. 2. Schubert wrote six settings: D. 460, D. 461, D. 730, D. 739 (Op. 45), D. 750, and D. 962. Vierne's treatment of it is his Opus 2. Duruflé's setting is contained as No. 4 of his Op. 10, Quatre Motets sur des thèmes grégoriens, published in 1960, and uses the plainchant melody.
Pierce Turner adapted the plainchant melody and text on a song of the same name on his 2016 album Love Can't Always Be Articulate.

Philippine use

The Church in the Philippines uses a separate hymn tune from the Pange lingua, whose first three strophes are otherwise sung to the melody used elsewhere. This particular tune, which is of Spanish origin, is credited to a "J. Carreras" and was originally published with a time signature of  but is now sung in quadruple metre in Luzon and in quadruple then triple metre in the Visayas.