yes, this topic has come up before -- I will even go so far as to call it a yart, but only because no one has come up with the word I offered just recently:

Date: Tue, 12 Feb 2002 09:48:34 -0600 (CST)
Subject: today's wwftd is... endomusia
To: wwftd minions
From: wwftd master

the worthless word for the day is: endomusia

silent recall of a melody; endomusia often appears as a type
of obsessive thought (Psychiatric Dictionary, 4th ed., Hinsie
and Campbell) -- for those of you with a tune stuck in your head


(wm)