Recommend me longer works for bass or baritone soloist?

Frank MARTIN: 6 Monologe aus »Jedermann« (1943/49)
:: Rehfuss & Martin [Jecklin] baritone & piano
:: Fischer-Dieskau, Martin/BPO [DG] baritone & orchestra
(disc 5, tracks 14-19)

Here's a note from the composer:

"When the baritone Max Christmann asked me in 1943 to compose a song cycle for his voice, I looked unsuccessfully for a long time for a poem which could energize me about the project. And when it occurred to me to leaf through the text of Hofmannsthal's Jedermann, I did not have a lot of hope that I would find something suitable in the play for a song cycle. I was lucky, however, and was able to extract six monologues [Martin's term, not Hofmannsthal's], which were so complete in themselves that they summarized in a moving way the psychological and mental development of the main character-beginning with the creature's fear of death up to his perfect surrender in trust in forgiveness, his gradual detachment from earthly things, and his ascent in fear and sorrow into the spiritual world. In the face of such themes, I could only have been silent if the poet had not led me, if he had not taught me that attitude of total simplicity and humility to which he took himself; in his octosyllable verses, the poet not only lets the simple language of age-old human fears resound but also the language of the Gospel of Redemption which teaches us through love. He opens the curtain just far enough that the drama of death and life, of sin and healing in the spirit of each listener, can unroll itself. Through the search for appropriate music to set this simple and meaningful language, I became even more aware of the wonderful construction of this dramatic poem, from its deep psychological understanding to the perfect beauty of language and form and the pure rhythm of the verse, so supple in their wonderful monotony and so truly medieval."

Schubert: Schwanengesang