 Sweelinck's influence therefore was primarily important in Germany, Heinrich Scheidemann and Gottfried Scheidt being the first major composers to study under him.Later northerners like Franz Tunder, Georg Böhm and Johann Adam Reincken all cultivated a harmonically and rhythmically complex improvisatory style rooted in the chorale improvisation tradition.Forms such as the organ prelude (a multi-sectional composition with numerous flourishes and embellishments such as scale runs, arpeggios and complex counterpoint) and the chorale fantasia (a musical setting of a whole verse of the chorale text, resulting in a multi-sectional composition with contrasting sections for different lines) were developed almost exclusively by north German composers.