The project that has placed pianos in the Iowa City ped-mall demonstrates a well-understood truth: music draws people together. What is it about someone sitting down at a piano in a public place that makes us want to join in and sing? We'll talk to Steve West of West Music in Coralville; music therapist Mary Adamek; Eric Saylor, Drake University Musicologist; and Jennifer Hamilton with Prairie Harmony of Southeast Iowa, a "sacred harp" singer.