On Wed, 25 Feb 2009 21:33:43 -0000, "nightjar" cpb@insert my surname
here.me.uk wrote:

Under The Copyright, Designs and Patents Act 1988, there are very few
businesses that are not liable to obtain a licence. Essentially they are
one-man businesses not open to the public and those that use no copyright
music at all in any form, including playing a radio in the workplace and
music on hold telephones..

There are many copyright free "music on hold" discs available for
purchase for telephone use and many similar audible wallpaper discs.