I remember DJ friends telling me that a certain station in the Cleveland area would do their "500 Greatest Songs as chosen by listeners" This should tell you how long ago: "Send us your top 3 picks on a postcard to and we'll agitate, cogitate, mix-up, stir around, employ mathematicians, throw 'em in a barrel and play them from #500 to #1 over the Memorial Day/July 4th/Labor Day weekend." They said it was a joke because the "powers that be" at the station had already decided what was going to be the top 50 songs played regardless of what the listeners chose. So yeah, I think most are a scam. Over the years, it dropped from 500 to 300 to 200, guess so they could jam more commercials in. Hey! Maybe they should do a "Top 500 of Your Favorite Commercials" holiday countdown.