That's a good point! In the interest of not loitering in the Wayback Machine too long.. Back in the late 70's, the station I was working for did internal call-out research and music tests, introducing themselves with a phoney business name. We recorded all the calls (we did notify the respondent that they were being recorded). I remember listening to some of the recordings, many of those surveyed when asked if they can recall what radio stations they regularly listen to, responded with answers like: "Well sometimes I listen to Channel 4, and I really like that weatherman on Channel 7". The person conducting the survey would usually try to get the person back on track by saying: "Sure, but what about your favorite radio stations?" The respondent would always answer something like: "Yes, those are my favorite radio stations!" Thank them for their time and move on..