musicomania

from The Collaborative International Dictionary of English v.0.48

Musicomania \Mu`si*co*ma"ni*a\, n. [Music + mania: cf. F.
   musicomanie.] (Med.)
   A kind of monomania in which the passion for music becomes so
   strong as to derange the intellectual faculties. --Dunglison.
   [1913 Webster]