"The Motives and Their Function in the Opera, Explained and Illustrated by Ernest Newman"
(Recorded 1928, London)
This record was included with Columbia's abridged Bayreuth Festival recording of the opera conducted by Karl Elmendorff.
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The notated examples are from the English National Opera Guide to "Tristan und Isolde" (Opera Guide No. 6). They don't correspond exactly to Newman's illustrations as he plays them.
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"Tristan und Isolde" ("Tristan and Isolde") is an opera in three acts by Richard Wagner, with a German libretto by the composer. The libretto is based on the medieval romance "Tristan" by Gottfried von Strassburg. It was first performed at the Royal Court and National Theatre in Munich on 10th June, 1865.