Amfortas (George London; ogg format)
The Amfortas motif and its variants can be heard whenever Amfortas is on stage and whenever the king is mentioned. It can be analysed as a derivative of the entire Grundthema (#1), and based on a minor triad. Most commentators include motif #40 as part of this Amfortas motif. I prefer to distinguish them as two parts of one complex.
Roger North, in his analysis of Tristan und Isolde, has drawn attention to the similarities between the first part of this motif (A) and a phrase that occurs three times towards the end of the Shepherd's Tune. Since Wagner drew a parallel between Amfortas and the wounded Tristan, this resemblance may not be coincidental.