Francisco de Peñalosa's quodlibet "Por las sierras de Madrid" occurs in the "Cancionero Musical de Palacio", a manuscript of the early 16th century. Composer Ludwig Senfl (1486–154?) was able to juxtapose several pre-existing melodies in a cantus firmus quodlibet; one such piece, "Ach Elselein / Es taget", was noted for its symbolism rather than its humor. In Spain, 1581 saw the publication of the "ensaladas" of Mateo Flecha et al. The "ensaladas" were comical compositions that mixed literary texts in a way similar to the quodlibet.