4th Order
- Official site. Includes news, biography, photo gallery, MP3s, wallpaper, forum, and merchandise store.
- http://www.4thorder.com

4Mag Nitrous
- Heavy stoner rock band from South Louisiana. Includes band biography, show dates, lyrics, pictures, and forum.
- http://www.4magnitrous.com/

40 lb. Head
- Pennsylvania pop/punk band. Biography, photos, articles, MP3s, show dates, chat, merchandise, and links.
- http://www.40lbhead.com

45s, The
- UK pop band. News, pictures, interviews, games, screensavers, reviews, lyrics, and links.
- http://www.ispythe45s.btinternet.co.uk

471
- News, profile, sound files, and calendar for the Christian rock/pop/praise band.
- http://www.the471.com/

4th Plane Jaiant
- Portland, Oregon jazz/pop quartet. Press and fan reviews, pictures, show dates, and merchandise.
- http://www.4thplanejaiant.com

4am
- Adelaide's hottest rock and soul band. Gig guide, song list, and pictures.
- http://www.adam.com.au/ramurphy/4am.html

40 Below Summer
- Some of the best heavy music on the planet. Includes biography, pictures, MP3s and show dates.
- http://www.40belowsummer.com/

4 of Us, The
- Dublin based pop/rock band. Official site includes news, history, discography, sound files, reviews, and tour dates.
- http://www.the4ofus.com/

40 Miles Out
- Adult contemporary music group from Dallas, Texas. Profile, pictures, and sound files.
- http://www.40milesout.com/

4th Ward
- Alternative pop/rock band. Includes a biography, pictures, news and reviews.
- http://www.4thward.com