William Ander Smith's 1990 book The mystery of Leopold Stokowksi is a good read, which isn't a surprise considering the subject. I've meant to mention it before, but here's a technology-related reason to do so. I just heard about the new features available in Google Book Search, one of which is embedding book previews. Here's Smith writing about the famous Stokowski recording of Uirapuru:
You can search within the embedded application to find more references to Villa-Lobos. Villa and Stokowski, two larger-than-life characters, seem to have really hit it off. Smith's book is still in print and available at Amazon.com.