"The 20th Century was shaped by the rise of professionals, but now a new breed of amateurs has emerged." With this thesis, Paul Miler and Charles Leadbeater open their book, "The Pro-Am Revolution – How enthusiasts are changing our economy and society". In recent history, more than a few innovations have emerged from amateur cultures and social niches, particularly in the area of digital culture. As a result of the easier approach to knowledge and technology, it has become possible for an ever-increasing number of individuals to participate in shaping society on a high level based on non-monetary motives as "professional amateurs". The borders between amateurs and professionals are thus becoming increasingly permeable. Through social networks, blogs and free downloads, an increasing number of lateral entrants, specifically in the field of music, are currently achieving unexpected relevance while many professional musicians, due to changing modalities of exploitation, are afraid of falling back into an amateur status. The discussion traces the societal impact and opportunities of this development.