Terpsichorean - that gooey grey/white gunge found on paint brushes that have been left in a pot of white spirit or turps, rather than being washed properly, and are now consequently, useless.

Harmonium - The guy who leans out of his window at 2.00am to complain about the singing in the pub car park.

Euphonium - The guy at the agents office who get the job of calling people to explain why they aren't getting any gigs.

LTS