Hello, I've been working on a library to encode/decode audio files (wave, aiff, etc.) to and from lazy bytestrings, and it's finally in a form where I'm willing to share. It's available at http://mml.music.utexas.edu/jwlato/HSoundFile/, lightly cabalized and haddock-ified. The basic item is a Data.SoundFile datatype and a SndFileCls class. Each file format (wave, etc.) has a datatype with instances of SndFileCls and Data.Binary (thanks to Don S. for suggesting Data.Binary). At least that's the idea, I've only implemented the Wave format so far, but I wanted to make it easy to add new formats. I originally intended to use Erik de Castro Lopo's excellent libsndfile (and there are some remnants of that in darcs), but after realizing I wanted a more functional interface I decided to roll my own. It's likely possible to wrap libsndfile in a functional interface, but that is beyond my current abilities. This library is far from complete. Firstly, only the wave format is implemented (and incompletely). There are also only minimal HUnit tests; I plan to add QuickCheck tests when I have some more time. Secondly there are performance issues. For relatively short clips it's fine, but there seems to be a space leak. Attempting to copy large files while just decoding and encoding the data will quickly exhaust available memory. Other than the space leak; performance is good. Profiling indicates that reading is extremely fast, and the slowest operations during write are the multiple calls to Data.Binary.Put.putWord16le (for 16-bit files). Also, sound data is currently read into a list. I will probably change this at some point in the future, most likely copying the lazy bytestring implementation and using a list of CFloat arrays. If anyone would care to offer suggestions (or patches), they would be greatly appreciated. This is my first real project in Haskell, so please be kind. I've successfully build it on ubuntu linux with GHC 6.6.1 and 6.8.1, and I don't see any reason it won't work on other platforms. Thank you, John Lato PS I'd appreciate knowing if this project is reinventing the wheel. I didn't see anything similar in hoogle or google, but you never know.