Go2Audio - The Web's biggest directory of sites related to audio, including hi-fi and home theater, pro audio, the audio and music industries, Internet and broadcast radio.
AudioWorld - Daily news about all aspects of audio, including professional audio, home recording, high-end and consumer hi-fi, home theater, car sound and the audio/music industries. The "Yahoo!" of Audio!
Music Submit - Sign up and get your website submitted to dozens of music search engines.
Music Sites - Submit your music site free of charge to this great search engine.