• (n.) A kind of monomania in which the passion for music becomes so strong as to derange the intellectual faculties.
Mu`si·co·ma'ni·a noun [ Music + mania : confer French musicomanie .] (Medicine) A kind of monomania in which the passion for music becomes so strong as to derange the intellectual faculties. Dunglison. 
Musicomania: A singular passion for music that is excessive and beyond all reason. From the French musicomanie, from music + -mania, frenzy.
musicomania An excessive fondness for music.