The Star Dwellers was not on my agenda. However, recently (here), we contemplated:
"...the song the worlds sang..." (SM Stirling);
the "Song Of The Earth" (Elliot S! Maggin);
the Great Dance (CS Lewis);
the music of the spheres (I think) (James Blish) -
- and wondered whether Poul Anderson's Aycharaych has a telepathic equivalent of cosmic song, dance or music.
Trying to find the music of the spheres led to rereading The Star Dwellers. Anyone who enjoys Poul Anderson's interstellar sf, e.g., his Dominic Flandry series, should definitely read Blish's equivalent works. Jack Loftus begins as a foreign service cadet and winds up confronting the Hegemony of Malis. Dominic Flandry begins as a Terran Space Navy Ensign and winds up confronting the Roidhunate of Merseia. In both cases, the universe is shown to be full of interesting intelligent life forms and the nature of civilization is discussed. Blish and Anderson show us the cosmos and ask ultimate questions.