In reply to:
Bowie (most likely) doesn't own the exclusive rights to them as they all involve either other musicians or film footage that he might not be able to get clearance for for commerical release.
Yet the same is not true for "Underground" or "Dancin' in the Streets"...
I'll be seeing YOU in New York, Detroit, Philadelphia, Boston, Kansas City, St. Louis, Washington DC, Moline, Wantagh, and Holmdel. So dress sharp.