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The upload rules below appear overwhelmingly long and detailed at first glance. However, the length is for explaining the rules clearly and thoroughly. A summary of each rule is in bold text before the actual rule for easier reading. You may also find the corresponding rule sections in the Index. The corresponding ↑ (move one level up) and rule section links (move down into the document) help provide quick navigation.
If you are still unsure of what a rule means before uploading something, PLEASE ask at any of the following forms of site user support: First-Line Support, The Help Forum, #what.cd-help on IRC. Privately message a moderator on the site if other support has directed you to a moderator for resolution or support has been unhelpful in your case. If you find any dead links in the upload rules, let a staff member know so it can be promptly fixed.
Only standard versions of each format are allowed. Hybrid formats that combine both lossless and lossy audio data such as DTS-HD and mp3HD are not allowed. AC3 and DTS are reserved for commercial media sources only if they contain such tracks; transcoding from any other source, including lossless (e.g. PCM and MLP formats), is not allowed.
This chart is an overview of how the dupe and trump rules work.
Note: The "Year" tag is optional, but strongly encouraged. However, if missing or incorrect, is not grounds for trumping a torrent.
Note: Classical music has a different tagging standard. In particular, classical music uploads must have both the composer and artist tagged properly. See this article for more information.
Monkey's Audio (APE), Apple Lossless (ALAC/.M4A lossless), and Wavpack (WV) are deprecated. No more new uploads in either of these 3 formats are allowed after April 20, 2009. Only unique releases with no alternative upload in FLAC are permitted to remain on the site. However, you are encouraged to convert them to FLAC.