 Some of the band's familiar compositions have been observed to have developed from live improvisations at its concerts or sound-checks.Throughout their career, Kraftwerk have pushed the limits of music technology with some notable innovations, such as home-made instruments and custom-built devices.The group has always perceived their Kling Klang Studio as a complex music instrument, as well as a sound laboratory; Florian Schneider in particular developed a fascination with music technology, with the result that the technical aspects of sound generation and recording gradually became his main fields of activity within the band.