 Although sheet music is often thought of as being a platform for new music and an aid to composition (i.e., the composer "writes" the music down), it can also serve as a visual record of music that already exists.Scholars and others have made transcriptions to render Western and non-Western music in readable form for study, analysis and re-creative performance.This has been done not only with folk or traditional music (e.g., Bartók's volumes of Magyar and Romanian folk music), but also with sound recordings of improvisations by musicians (e.g., jazz piano) and performances that may only partially be based on notation.