Ligeti's last works were the Hamburg Concerto for solo horn, four natural horns and chamber orchestra (1998–99, revised 2003, dedicated to Marie Luise Neunecker), the song cycle Síppal, dobbal, nádihegedüvel ("With Pipes, Drums, Fiddles", 2000), and the eighteenth piano étude "Canon" (2001). Additionally, after Le Grand Macabre, Ligeti planned to write a second opera, first to be based on Shakespeare's The Tempest and later on Carroll's Alice's Adventures in Wonderland, but neither came to fruition.