Hello! I need some help. I'm considering for some time a monosylabic conlang and I think tones would be very suitable for it, but... Tones are a very exotic thing for me and I have rather vague idea of uttering them and almost no idea of their possible origin. How can tones come into being? Are there any general rules or tendencies? I assume that monosyllabic morphemes of my language are results of reduction of polisyllabic words. How can such a reduction affect tones? Are there any tonal languages with well known tonogenesis or evolution of tones? I expect Tibetan to be quite interesting, but I don't have any source on it and I havn't found anything in the net. -- Łukasz K.