This is based on the 1988 edition of the New Grove Dictionary of Music and Musicians. The second edition was published in 2001, but the online version is subscription-based.
An excellent podcast about music composition by Nolan Schmit.
This site is an online community for sharing audio loops and samples. There is over 5 GB of audio.
This site contains a good selection of free music loops and sound effects - perfect for creating podcasts. The webpages are rather cluttered. (They want you to buy stuff.) Be sure to scroll to the bottom of the page for the free files.
This site contains a massive amount of free audio loops and samples. It has a great search engine.
Perfect for creating podcasts. Samples include Drum, Bass, Acid, Guitar, Synth, and FX in .wav format.
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Detailed explanation and history of podcasts.