A is for Adam's groovy musical instrument thingy....whatever it was.
B is for Banjoman's banjo.
C is for the Cestus star system.
D is for Deneva and the flying pizza monsters. And the uber hot black yeoman.
E is for Ermine violin, but I see no advantage in having one.
F is for Federation Funny Farm.
G is for Gowron's big, wide eyes.
H is for Holographic harps played by holographic nymphs in Riker's quarters
I is for Iridium inside a comet.
J is for Jem'Hadar loyalty.
K is for Kolandans. Apparently wiped out by a mysterious plague thousands of years ago.
L is for Lyre, Spock's Vulcan lyre.