Yeah, an on-air music survey is interesting to radio geeks - but unlistenable to the average person in an office and restaurant. Sounded ridiculous as background in a pizza place in Audubon, and people looked annoyed.
I've only heard such a thing on-air once before, which was when 94.1 in Salt Lake City (then KALL-FM, now KODJ) dropped bird feed and started doing oldies with local personalities and playlist (mid 90's). That represented a big change and was done prior to kicking off the format. Few were listening at the time. It was also done in such a way that you could pick up a "ballot" at a local convenience store chain, vote and mail it in. Prizes were given away to a select few as an incentive to "vote" for what music you like.
B101 is a very popular station, especially during weekday work hours. All such a survey will do is drive away the average listener. It just strikes me as a dumb way to do things. Especially when they have more to lose than gain. Not to mention messing with a successful playlist. You know how it goes, if it ain't broke....