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When Dave Goldberg and Bob Roback abruptly resigned from Yahoo Music, neither they nor Yahoo provided any particular explanation for the move. Yahoo gives only the "personal reasons" chestnut, with Goldberg and Roback declaring airy aspirations for a return to "entrepreneurial roots." The explanatory void leaves the tech media free to speculate, and they're all over the map.

Perhaps Goldberg and Roback left because of opposition to DRM, or due to Yahoo Music's overall troubles, or as part of a general exec exodus from Yahoo, or to join other former Yahoo execs' startups, or because Goldberg and Roback's original Yahoo-bought company, Launch Media, will be spun back out and sold (quickly denied by Yahoo). Interestingly, Goldberg was interviewed by Jason Calacanis for Santa Monica's KCRW on Monday; Goldberg supposedly resigned that evening. He didn't mention any departure plans in the interview, so either he knew and cheerfully kept his own counsel, or he got ambushed by some other development later in the day that prompted his immediate exit. Thoughts?