Michael Butler of the Rock & Roll Geek Show was one of the guests who stopped the MacVoices at Expo featuring Pandora event on Friday night of Macworld Expo. MIchael talked about his show, why he selects the guests he does, and why that has helped make his, one of the original podcasts, one of the most real and most successful. Michael talks about the popularity of classic rock and how he uses Pandora as a way to hear his favorite tracks and sometimes learn about new bands as well.