A website is used by a band for several reasons. -

Firstly they use websites to To inform the fans. This is an effective and free way of advertisement and letting them know of upcoming events. They are also used to  Sell merchandise and promote and sell album which would gain the artists themselves more money. this is also done by selling thier tickets on their website for their live shows. This is also useful especially for smaller artists as people will then be able to contact them and try and talk to them about future signings and performances that they can do. And finaly it is a direct link to the audience going well with Dyers star theory making them easily accessable to see however still not completely accessible.