Why do music channels have a person signing the music to the deaf?

Surely if they are deaf then they can’t hear the music anyway!

Due to the fact that I was bored I decided to have another search on Youtube.com and provide a second edition of CARTOON NOSTALGIA!

Alvin & The Chipmunks
http://youtube.com/watch?v=npObNVS6Gck

Charlie Chalk
http://youtube.com/watch?v=HWfjngbSt9Y

Count Duckula
http://youtube.com/watch?v=tnCpMHKCasU

Denver The Last Dinosaur
http://youtube.com/watch?v=vzjS4Tz5Uuc

Ducktales
http://youtube.com/watch?v=42xM1kLPrYo

Dungeons & Dragons
http://youtube.com/watch?v=mfif5DiGMYc

Inspector Gadget
http://youtube.com/watch?v=iKeE3saeguY

Jamie and The Magic Torch
http://youtube.com/watch?v=-B_FQKHQDYk

Poddington Peas
http://youtube.com/watch?v=HE476Yl0GDk

Teenage Mutant Hero Turtles
http://youtube.com/watch?v=qI0FbYe3lRE

The Family Ness
http://youtube.com/watch?v=gxjqMZd-BVE

The Magic Roundabout
http://youtube.com/watch?v=c3DcChXNyYQ

The Morph Files
http://youtube.com/watch?v=IoQm5kSiAE0

The Smurfs
http://youtube.com/watch?v=OLQhm0KHImM

Raggy Dolls
http://www.youtube.com/watch?v=vrDiW00__C4

Wacaday
http://youtube.com/watch?v=PZGPOPV2tjY

If you want to check out part one then click the link below:
http://eastlondonpromotions.co.uk/deansaliba/?p=59

Why is it OK for a company to only accept female clients but it is then considered sexist for a similiar company to only accept male clients?