Besides the violin concerto if it exists*, have there been recordings of his Walpurgis Night (Op.60 (p.1908)) , Ouverture espagnole , Introduction & Rondo for clarinet & orchestra Op.72 (I see the clarinet & piano version is recorded), choral & variations for harp & orchestra , ... oh... wait- squirrel... no, seriously, are there?
*Oh wait- here it is! 1894 autograph of the violin concerto, at BNF. Yay!! (http://catalogue.bnf.fr/ark:/12148/cb43337426h/PUBLIC)
Well sleuthed, Eric! Excellent news. Now all we need is to SEE IT!!!
As to your question, I am not aware that any of the pieces you mention has received a commercial recording yet. I languish to hear them.
Without knowing a note of the concerto, I can imagine it make a good coupling for the Dubois Concerto should Hyperion's series ever incline that way. The current Dubois on disc is a bit rough and ready...
David
Did Widor actually make an orchestral version of the Introduction & Rondo? That's actually a pretty popular recital piece -- actually I heard of Widor from that before I ever heard of any organ symphonies.
IMSLP doesn't make note of anything but the clarinet and piano version at least.
I think BNF has an orchestral version of the introduction & rondo, but you're right, it might not be by Widor... it was composed in 1898 and orchestrated as late as 1935 (see BNF catalogue listing (http://catalogue.bnf.fr/ark:/12148/cb43337441d/PUBLIC) (still, Widor died in 1937, so it _might_ be by Widor...))
(" Daté à la fin : "8 juin 35". - Orchestration d'une oeuvre pr. clar. et piano parue en 1898. - Il y a une p. 14 bis. - Collettes. - Indic. au crayon. - Ms. ayant servi à la gravure")
Widor composed also an impressive "Symphonie Antique" with final chorus (Te Deum) op. 83 for Orchestra and Organ. This is available on the MOTETTE Label CD 40181.