About this blogger:
A theorist, organist, and conductor, Jeff Ostrowski holds his B.M. in Music Theory from the University of Kansas (2004), and did graduate work in Musicology. He serves as choirmaster for the new FSSP parish in Los Angeles, where he resides with his wife and children.
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When we say: "The people like this" we regard them as unable to develop, as animals rather than human beings, and we simply neglect our duties in helping them towards a true human existence — indeed, in this case, to truly Christian existence.
— Professor László Dobszay (2003)

Organ Improvisation • Stupefyingly Awesome!
published 17 July 2017 by Jeff Ostrowski

MMEDIATELY AFTER the ALLELUIA by Guerrero, Dr. Horst Buchholz improvises in a marvelous way, based on the “Tu Es Petrus” plainsong theme:

We usually add a short organ piece after the Gospel, when the Subdeacon carries the Evangeliarium to be kissed by the celebrant, who is then incensed, walks to the pulpit, dons his biretta, and so forth.

I don’t know if this is written down “officially” in the rubrics, but the sacred liturgy has always been considered something living. For the record, Fr. Adrian Fortecue allows—in his sensational handwritten book of instructions—organ music at the same place shown in the video:

115 Fortescue Liber Organi

Fortescue doesn’t want it after the Gospel, probably because he never had Solemn High Mass at his parish church.