A recording of the offertory Exaltabo te Domine in proportional rhythm: YouTube video. Please see the video description on YouTube for an explanation of the color coding; see also my recent article discussing this chant.
“A much greater source of anxiety to Us is the style of action of those who maintain that liturgical worship should shed its sacred character, who foolishly say we should substitute for sacred items & furnishings ordinary common things in daily use.” —Pope Saint Paul VI (14 Oct 1968)