Eight years ago, I gave a paper on “house concerts for art music” to economists in love with music in Copenhagen. Today, Groupmuse is one of the grassroot initiatives that intermediates between artists and venue owners to realise such a concept. On Maui, I know of a clarinettist who produces these concerts from his home — always sold out. In and around Utrecht, I know of at least two. What are the issues that confront turning your private space into a concert venue for the public?