Curt Siffert's Piano Musings http://curtsiffert.com/pianomusings
Original neoclassical, jazz, and new age piano compositions

Free Sound Effects http://www.jlstudios.ca/free_sound_effects.html
Hear and download sound effects recorded digitally at the studio.

Sound Jay's Free Sound Effects http://www.soundjay.com/
Free high quality sound effects in wav and mp3 formats

National Education Network http://gallery.nen.gov.uk/gallery799-.html
All the resources in this Gallery have been provided free for Educational use only. These ARE NOT copyright free: the copyright in the resource is retained by the resource owner and any commercial use is explicitly excluded. 

WavCentral http://www.wavcentral.com/ 
Another site that provides free wav sounds for you to download and use. Wav Central is divided into a number of different sections including a search engine, movie clips, TV sounds and commercials. The site also features a 'clip of the day' which as you can guess is updated every day.

Free Sound Effects and Loops http://www.freesoundeffectsandloops.com
Free sound effects and music loops

Free audio loops at Flaskits http://www.flashkit.com/loops/
Free music loops

National Anthems and Passports http://www.national-anthems.net/
Dedicated to national anthems (in mp3) of countries and territories. 

Laura's Midi Heaven http://www/laurasmidiheaven.com  
A simple yet charming website that provides free midi files for you to use on your website. The midi files are divided into various catagories to make navigation easy, and they offer absolutely hundreds in each catagory!

SoundTransit http://soundtransit.nl/
SoundTransit is a collaborative, online community dedicated to field recording and phonography.

Soundsnap http://www.soundsnap.com/ 
Hear and download sound effects 

SampleNet http://www.samplenet.co.uk/ 
Contained within the site are over 3000 samples, and the number is growing all the time. No matter what you want, the chances are this site will have it...from breakbeats to sequencer stabs, guitar riffs to vocal refrains, they have got everything you need to help you make your tracks the best. Best of all...they are all royalty free!

Sound Effects and Production Music Library http://www.sounddogs.com
Sounddogs.com Sound Effects and Production Music Library
235,000 sound effects and production music tracks online,immediately available in Mp3, Wav, and Aif.

My Kindergarten : Music and Songs : Free Downloads http://www.hyperionbooksforchildren.com/my_kindergarten_audio/index.html
Children's song available for download

Free Sounds and Music http://thefreesite.com/Free_Sounds/
These range from MP3 files to MIDI (Musical Instrument Digital Interface) files that you can use to add music to your Web site.

Estúdio Livre http://estudiolivre.org/el-gallery_rss.php?ver=2&type=Audio 
Hear and download free songs

Uwe Hermann's Music Podcast http://www.hermann-uwe.de/podcast 
Hear and download free songs