Today's dance scene is rich in the quantity of songs, rather than the quality. But if you look closely and keep your ears open, you'll find some of the electronic gems hidden under the surface. Dutch producer Mark Otten is responsible for quite a few. His 'Mushroom Therapy' hit the surface around 2003 and now ranges on the list of today's trance classics. Though they all share that same distinctive, well thought-out sound, there's another thing that binds this man's productions. 'So Serene' and