[Haskell-beginners] Playing and combining audio files

Hello, I'm searching for a library with which I can process audio files (.wav or .mp3). All I need is functions with which I can - play audio files - concat several audio files to one audio file Can you suggest a library for this task? I looked through http://hackage.haskell.org/packages/archive/pkg-list.html#cat:sound but I didn't manage to find ways to do this respectively sample code for this. Any hints are welcome- thanks, Tobias