My wife has subscribed to Sibelius Music's service and thinks it is wonderful. The only difficulty is that her computer is not where she wants the music most of the time. We could extend the speaker cables but that would be messy and inconvenient. Graeme O Churchard
The simplest option would be to buy wireless speakers, or even wireless headphones. These come with a wireless transmitter that should plug into the PC sound output via a 3.5mm jack. Searching for "wireless speakers" (at http://www.buycentral.co.uk/qsh/wireless+speakers.html) finds a number of products such as CGV's wireless speakers and the Rimax Wireless Speakers. Both are available from several sources, so shop around. I have not heard any of these products and cannot comment on the sound quality, but perhaps readers can.
Correction: Sorry, the original said "3.5in jack"!