
Bands tend to use websites to promote their music, especially new releases, give information, issue tour dates sell music for both download and hard copy, and also publicise and market merchandise. They can include Youtube links to music videos, background music when the site opens etc, there are often links to tv/radio shows, interviews and other kinds of publicity. Most offer a forum for fans to interact (a form of social media and links to other forms of social media).
Some bands/artists use the webpage to show their views and opinions: Radiohead use a blog to promote environmental issues, waste central is the official social media site for Radiohead fans to publicise their views - it is quite political, very environmental and a spring board for Thom Yorke's opinions.