sentences:  In these theories, operations over attribute-value matrices (feature structures) are used to account for many of the same facts.Though Merge is usually assumed to be unique to language, the linguists Jonah Katz and David Pesetsky have argued that the harmonic structure of tonal music is also a result of the operation Merge.This notion of 'merge' may in fact be related to Fauconnier's 'blending' notion in cognitive linguistics.