I have to correct myself and apologize for my fast response - we're both right regarding # 4, the Bix solo.
Bix himself recorded only this one piece, In A Mist.
Jess Stacy recorded a medley of In The Dark & Flashes for British Parlophone in 1935, and Candlelights for Commodore in 1939.
Ralph Sutton recorded all four pieces as a suite for Commodore in 1950.
I also have complete recordings by Kenny Werner (Finnadar, 1978, reissued on Atlantic CD), and Italian classical pianist Marco Fumo (Dynamic, 1987), the latter in a very interesting recital he calls Last Time Rag, that ranges from Scott Joplin and Jelly Roll Morton over Bix and Fats Waller to Debussy and Stravinskij and 1980's composers.
Any other recordings any board member knows about? (Thanks, as always!)