In the days of classical music, all compositions were sketched on manuscripts – the technology to record music did not exist. Often these manuscripts are roughly sketched, with drafting work scribbled over the top of the music, and have been found in unordered piles. Many unfinished symphonies have been pieced together from these original manuscripts by other composers, after the original author's death, with some remaining incomplete until many decades later. One of the most famous examples of unfinished musical compositions is Franz Schubert's "Symphony No. 8 in B minor", or as it is more commonly known, "The Unfinished Symphony". Another famous unfinished classical piece is Mozart's "Requiem", famous in part because of the numerous myths and legends that surround its creation and in part because of Mozart's prestige. At the time of his death, Mozart had fully orchestrated only the first movement, leaving nine further movements in varying states of completion. Franz Xaver Süssmayr, an acquaintance of Mozart, finished the nine incomplete movements and wrote four more. Gustav Mahler's Symphony No. 10 was incomplete, with only drafts, sketches, and two mostly orchestrated movements existing at the composer's death. Several people have "completed" it with varying degrees of success, the most notable of these being Deryck Cooke's "performing version of the draft."