Vol. 1 EX. 6-3 Viderunt Omnes (perhaps by Leonin)

Youtube version from the album "Music of the Gothic Era"

Listen to a several versions from the Liber Usualis, Leonin and Perotin on the album "Sacred Music from Notre-Dame Cathedral" at the Naxos site (requires a subscription $20/year) • Link to streaming album

Or download the album from Amazon:

Vol. 1 EX.5-10 • Verbum Patris Humanatur

Various Mp3 Versions:

Vol. 1 EX.5-9 Congaudeant Catholici

Various Mp3 versions:

Vol. 1 EX. 5-8 "Cunctipotens genitor"

EX. 5-8A: "Cunctipotens genitor" setting from "Ad organum faciendum"

You can download a version by Hortus Musicus here:

EX. 5-8B: "Cunctipotens genitor" setting from "Codex Calixtinus"

Note: there is a slight difference in alignment compared to the score found in OHWM. Taruskin notes "alignment was not a matter of great concern to the copyist" p.165.
Download version by Anonymous 4:

Vol. 1 EX. 5-7 • Ad superni regis decus

Listen to the full track by Anonymous 4 from the album Miracles of Sant'Iago: LINK

Download Mp3 from Amazon (two different versions available):

Vol. 1 EX. 4-15 Hans Sachs, "Silberweise"

No free streaming audio as of time of posting, but you can listen to 30 seconds of this track at Amazon from the album "De Machaut à Duparc" by Hugues Cuenod (which appears to be the only recording of this piece currently available online).

Vol. I EX. 4-14 • Anon. (Pseudo-Neidhardt), "Meienzit"

This CD is available at Amazon: