I should have tried to read the cover notes though ... (not as easy in the 800x696 size and with the gray background). There it reads: Warm Valley is primarily a vehicle for Johnny Hodges. In his two alto sax choruses, Hodges displays his talent for flawless phrasing. The delicate nuances he introduces are moving and expressive. ...
And the lineup is also listed on the reissue record label in the album.
"Warm Valley", the H side, is a wonderful mood piece from Ellington's classic "Blanton-Webster" band. It seems to sound a bit different on the Victor 20-1534 pressing, listen here:
Whereas the original record label and the Panorama website list the lineup of the October 17, 1940 session, they don't note the soloists. You can find them, however, in the CD booklet of The Blanton-Webster Band that I have uploaded to 45worlds CD Albums some years ago, revealing that the highly emotional reed solo here is actually played by Johnny Hodges on alto saxophone.
This is not only a very fine compilation but also the name giver of the best Duke Ellington website there is: A Duke Ellington Panorama
There you can easily track the different recordings of these Ellington classics that are here mostly not in their original versions:
East St Louis Toodle-Oo [Duke Ellington-Bubber Miley]
#1| 29 Nov 1926 | East St Louis Toodle-Oo | E4110W | Vocalion 1064
#2 |14 Mar 1927 | East St Louis Toodle-Oo | E21873 | Brunswick 3480
#3 | 22 Mar 1927 | East St Louis Toodle-Oo | W143705-3 | Columbia 953-D #4 | 19 Dec 1927 | East St Louis Toodle-Oo | BVE41245-2 | Victor 21703
...
The Mooche [Duke Ellington-Irving Mills]
#1 | 1 Oct 1928 | The Mooche [Baby Cox, vocal] | W401175-A | Okeh 8623
#2 | 17 Oct 1928 | The Mooche | E28359-A | Brunswick 4122
#3 & #4 | c 19 Oct 1928 | The Mooche | 108446-1 / -2 | Pathe 36899 # 5 | 30 Oct 1928 | The Mooche | BVE47799-2 | Victor V-38034
...