Obvious, yes, but there are several options. First, do you want music to play right when you hit your site? If so, add tracks to the SITE WIDE MUSIC PLAYER. Next, decide if you want to make music downloadable (either paid or for free). Add these using the ALBUM DOWNLOAD feature.
A way to contact you
A MAIL FORM is the best option. If you just put your email address on the page as text, spammers will find it and spam you (the mail form has anti-spam protection). If you choose to put a phone number or address, remember that anything you post will be in the public domain, and can be saved somewhere. Do you really want fans to know where you live?
A list of events
The EVENTS feature makes this easy. For each show, make sure to put the full venue address, showtime (when does the show start, and when is your set?), cost, and age (all ages, 18+, 21+?).
A bio/press kit
Using a TEXT feature explain who you are, your background, and your sound. If you want to get into print media, add a link to a downloadable press kit containing hi-res photos. Check the HELP section for more info on this.
A news page/blog
Keeping updated content is the key to getting repeat visitors. Your front page is the best place for this. Blog posts don't have to be major news. Smaller, weekly posting is better than large articles every few months.
Mailing list signup form
Your mailing list is the best way to keep in touch with fans. Have the signup form on the front page, or better still, at the bottom of every page.
A way for fans to interact
A guestbook or forum lets you build a fan community on your site. They also help create return visits, because fans that post will come back to check who replied.