On the 30th of November 1857 Richard Wagner wrote the music to the song: "In der Kindheit frühen Tagen."
December 4, 1857, the first sketch for: "Sag', welch' wunderbare Träume?"
December 5, 1857, the second version of "Träume."
December 17, 1857, "Schmerzen"; with a second, somewhat lengthened close. This was soon followed by a third close, beneath which stood the words:
"It must become finer and finer! After a beautiful, refreshing night, my first waking thought was this amended postlude: we'll see whether it pleases Frau Calderon, if I let it sound up to her to-day."
February 22, 1858, "Sausendes, brausendes Rad der Zeit."
May 1, 1858, "Im Treibhause." —
All five songs subsequently came out at Schott's Sons, Mainz, by the master's own instructions. — Before their publication, "Träume" and "Im Treibhause" were named by himself "Studien zu Tristan und Isolde."
Source: Richard Wagner to Mathilde Wesendonck, trans. William Ashton Ellis (Charles Scribner's Sons, 1905), No. 35