He recorded several tunes by other organists. 
 
On "Damn!", there was "Papa's got a brand new bag". 
On "Hoochie coochie man", he recorded Q's arrangement of "One mint julep", done for Ray Charles' organ (but not a tune by an organist, I agree) 
On "Plays pretty for you", there's Fats Waller's "Jitterbug waltz" - about the earliest jazz standard written for the organ. 
On "Small's Paradise" and "House party", he recorded "Lover man", by Ram Ramirez. 
And on "Prime time", there's a wonderful version of Bill Doggett's "Honky tonk". 
 
MG