Karlheinz Stockhausen included a larger-than-life-size puppet of a bird man, automatically shifting between musicians, a glockenspiel, sound plates, a humming top and, above all, three music boxes in his score, which contains more stage directions than music in the usual context. For Musik im Bauch, the composer had a set of twelve music boxes built with his Tierkreis melodies, which were composed for this purpose and can also be performed independently; the random selection of three of these boxes determines the respective performance of Musik im Bauch.
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