This is a famous riddle by Lewis Carroll's Alice in Wonderland. There is no official answer. However in his 1896 book, he wrote in the preface:
"Enquiries have been so often addressed to me, as to whether any answer to the Hatter's Riddle can be imagined, that I may as well put on record here what seems to me to be a fairly appropriate answer, viz: `Because it can produce a few notes, tho they are very flat; and it is nevar put with the wrong end in front!"
Famous puzzle maven, Sam Loyd, gives two other possible answers:
1. Because the notes for which they are noted are not noted for being musical notes.
2. Because Poe wrote on both.