Because it can produce a few notes, though… they are very flat; and it is nevar put with the wrong end in front!" (nevar=raven)
or
Because the notes for which they are noted are not noted for being musical notes
or
Poe wrote on both
or
They both have inky quills ("inkwells")
or
Bills and tales ("tails") are among their characteristics
or
Because they both stand on their legs, conceal their steels ("steals"), and ought to be made to shut up
heh, Do you think Hatter would let me in now? =D