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NAudio is an open source .NET audio and MIDI library, containing dozens of useful audio related classes intended to speed development of audio related utilities in .NET. It has been in development since 2001 and has grown to include a wide variety of features. While some parts of the library are relatively new and incomplete, the more mature features have undergone extensive testing and can be quickly used to add audio capabilities to an existing .NET application.

Features:

Play back audio using a variety of APIs
WaveOut
DirectSound
ASIO (not currently working with all soundcards)
WASAPI (Windows Vista Core Audio)
Decompress audio from different Wave Formats
MP3 decode using ACM or DMO codec
AIFF
G.711 mu-law and a-law
ADPCM
G.722
Speex (using NSpeex)
SF2 files
Decode using any ACM codec installed on your computer
Record audio using WaveIn or WASAPI
Read and Write standard .WAV files
Mix and manipulate audio streams using a 32 bit floating mixing engine
Extensive support for reading and writing MIDI files
Full MIDI event model
Basic support for Windows Mixer APIs
A collection of useful Windows Forms Controls
Some basic audio effects, including a compressor