The Orgelpark is a concert venue in Amsterdam; its aim is to integrate the organ into musical life in general. The Orgelpark initiated the Orgelpark Research Program in 2008. The Orgelpark Research Reports are published in cooperation with the Chair of Organ Studies at VU University Amsterdam. The Orgelpark Foundation established the Chair in 2010. Orgelpark Research Report #3 presents a selection of the lectures given in the course of the International Organ Improvisation Project at the Orgelpark. The project took place between 2008 and 2011.