Listening to music: A private or public activity?

In the past, listeners experienced music in public venues as a shared sensation. Today, however, music is a ubiquitous backdrop to everyday life, experienced in lifts, in TV jingles or on a multitude of radio stations. Do we need concert halls when we can access personal playlists in our own time?  This Battle of Ideas debate is a treat for viewers and listeners and includes a surprising, spontaneous performance.