When was the last time someone in radio solicited your feedback? (And I’m not talking about that annoying call-out research where you listen to like 30 seconds of three songs.) Displaying an approachableness absent from one-way media like radio, television and newspapers, the founder of the free internet music service Pandora, Tim Westergren, arrived in Cleveland last Friday to talk to over 100 of the city’s 25,000 Pandora users as part of a national tour…