This paper presents the sonified music stand, a novel interface for musicians that provides real-time feedback for professional musicians in an auditory form by means of interactive sonification. Sonifications convey information by using non-speech sound and are a promising means for musicians since they (a) leave the visual sense unoccupied, (b) address the sense of hearing which is already used and in this way further trained, (c) allow to relate feedback information in the same acoustic medium as the musical output, so that dependencies between action and reaction can be better understood. This paper presents a prototype system together with demonstrations of applications that support violinists during musical instrument learning. For that a pair of portable active loudspeaker has been designed for the music stand and a small motion sensor box has been developed to be attached to the bow, hand or hand wrist. The data are sonified in real-time according to different training objectives. We sketch several sonification ideas with sound examples and give a qualitative description of using the system.