WavPack is a free, open source lossless audio compression format developed by David Bryant. WavPack compression (.WV files) can compress (and restore) 8, 16, 24 & 32-bit float audio files in the .WAV file format. It also supports surround sound streams and high frequency sampling rates. Like other lossless compression schemes the data reduction varies with the source, but it is generally between 30% and 70% for typical popular music and somewhat better than that for classical music and other sources with greater dynamic range. WavPack also incorporates a unique "hybrid" mode that provides all the advantages of lossless compression with an additional bonus: Instead of creating a single file, this mode creates both a relatively small, high-quality lossy file (.wv) that can be used all by itself, and a "correction" file (.wvc) that (when combined with the lossy file) provides full lossless restoration. For some users, this means never having to choose between lossless and lossy compression.