What's the difference between monomania and musicomania?

Monomania

Definition:

(n.) Derangement of the mind in regard of a single subject only; also, such a concentration of interest upon one particular subject or train of ideas to show mental derangement.

Example Sentences:

(1) Just as it’s possible to oppose George Osborne’s initial deficit monomania on sound, Keynesian grounds without wanting to jettison the pound, so it poses no contradiction to demand an end to Merkelism while wanting to hold fast to the euro.
(2) Hatred becomes monomania when the affect degenerates maniacally (e. g. queruousness) or perversely (e. g. misogyny).
(3) That's why the current satirical onslaught against politics as a whole, which amounts sometimes to monomania and increasingly to cliche, ought at the very least to be a proper subject for discussion.
(4) At the trial Baker's attorney argued unsuccessfully that at the time of the crime the accused suffered from monomania, a form of mental disease, and therefore should not be held responsible for the act.
(5) During this period pyromania was variously labeled as a form of monomania, moral insanity, impulsive mania, or instinctive mania.
(6) But it doesn't matter; the company's monomania, it's collective passion is undeniable.