I only vaguely remember the story from earlier in the year, but the project behind CC Search search tool developed by Creative Commons has been adopted by WordPress and named now “Openverse”
Results provide a player, download, license details, tags, and one one of the best things-- cut and paste text for attribution. Here take a listen to Dogs Drinking Water
Search filters include by specific license, category (music, sound effects, or podcast), duration (short, medium, long), file type (mp3, ogg, flac, but I note I saw wav results too) and source ( FreeSound, Jamendo, or Wikimedia Commons). This is beta so I would bet more sources will be added – among my favorites for audio is the Free Music Archive and ccMixter)
But I am excited to see audio media tossed into the search, and that you can be sure more will be added.
Openverse sounds like a good place to find open licensed audio…