An idée fixe is a preoccupation of mind held so firmly as to resist any attempt to modify it, a fixation. The name originates from the French [French : idée, idea + fixe, fixed]. Although not used technically to denote a particular disorder in psychology, idée fixe is used often in the description of disorders, and is employed widely in literature and everyday English.
Musically, the term is sometimes used for a recurring theme, maybe abstract or maybe (particularly in opera) denoting a particular character or event (a "leitmotif"). You'd use one by..er. using one!
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An idée fixe is a preoccupation of mind held so firmly as to resist any attempt to modify it, a fixation. The name originates from the French [French : idée, idea + fixe, fixed]. Although not used technically to denote a particular disorder in psychology, idée fixe is used often in the description of disorders, and is employed widely in literature and everyday English.
https://en.wikipedia.org/wiki/Id%C3%A9e_fixe_%28ps...
Musically, the term is sometimes used for a recurring theme, maybe abstract or maybe (particularly in opera) denoting a particular character or event (a "leitmotif"). You'd use one by..er. using one!