", 2003) and Fourth String Quartet (2003), and the Hungarian composer György Kurtág has also extended his series of (unnumbered) works for this medium, with "Six Moments Musicaux" (1999–2005), "Hommage à Jacob Obrecht" (2004–2005), and—in collaboration with György Kurtág junior—"Zwiegespräch" for string quartet and electronics (1999–2006).