Obligato

from WordNet (r) 3.0 (2006)
obligato
    n 1: a persistent but subordinate motif [syn: {obbligato},
         {obligato}]
    2: a part of the score that must be performed without change or
       omission [syn: {obbligato}, {obligato}]
from The Collaborative International Dictionary of English v.0.48
Obligato \Ob"li*ga"to\, a. [It.]
   See {Obbligato}.
   [1913 Webster]
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