This depends on what type of sound system you need. Most integrated motherboards has the sound card inbuilt.
If you buying a motherboard without a soundcard inbuilt you will get an idea of what you will need, also about the sound system device:
TV tuner card : http://ccm.net/faq/1224-choosing-your-tv-tuner-card
CCM is a leading international tech website. Our content is written in collaboration with IT experts, under the direction of Jeff Pillou, founder of CCM.net. CCM reaches more than 50 million unique visitors per month and is available in 11 languages.