"Morgen" is one of my favorite songs. I've long favored soprano Arleen Auger's version on her debut CBS LP from the mid-1980s. During this later stage of her career, Auger enjoyed kind of 'Indian summer' vocally, with her gorgeous voice remaining remarkably fresh at an age when most singers' voices have started to go into decline. She is accompanied by the excellent pianist Irwin Gage, & the sound recording is first rate. However, on CD, it was an early digital era disc & these days could use a fresh remastering (& hopefully will get reissued soon). Here they are performing "Morgen" live in concert around the same time,
Dame Janet Baker's studio version is another great favorite of mine, with pianist Gerald Moore:
In addition, there's a BBC recording from Baker at the Aldeburgh Festival, as well as a beautiful live performance of the orchestral version from Baker on You Tube, which are well worth hearing:
Among other piano versions, I've liked soprano Gundula Janowitz, as well, again with Gage, performing the song live in a concert at the Concertgebouw in 1977:
Gundula Janowitz sings "Morgen" by Richard Strauss (1977, Audio Only)_哔哩哔哩_bilibili
While among the older recordings, I've liked Lisa Della Casa's 1962 recording with pianist Sebastian Peschko:
Lisa della Casa: Morgen! by Strauss.
As for the orchestral versions, I've most liked two recordings--(1) from Felicity Lott with conductor Neemi Jarvi, & (2) Gundula Janowitz with Richard Stamp:
Lastly, I wanted to add that I very much like the insightful playing of Michael Raucheisen in his piano version with Elizabeth Schwarzkopf, but find her singing overly loud & insensitive in comparison, & unfortunately, ill-suited to his fine artistry:
Elisabeth Schwarzkopf sings Morgen by Richard Strauss (1945)_哔哩哔哩_bilibili.