Audacity: Audio Editor & Recorder
Audacity is an easy to use audio editor and a great addition to any home recording studio. It's also a very useful practice tool because it allows you to change the tempo of a song without changing its pitch, (and vice-versa).
Audacity is available for Mac OS X, Microsoft Windows, GNU/Linux, and other operating systems.
The latest release is 1.3.11 beta which is recommended for advanced users and anyone using Windows Seven. The stable release is also available for download but is no longer updated. You can run both versions on the same system with no issues.
Record live audio - Up to 16 channels at once
Convert tapes and records into digital recordings or Cd's.
Edit Ogg Vorbis, MP3, WAV or AIFF sound files.
Cut, copy, splice or mix sounds together.
List of all features
Record and edit 16-bit, 24-bit, and 32-bit (floating point) samples.
Record at up to 96 kHz.
Sample rates and formats are converted using high-quality resampling and dithering.
Mix tracks with different sample rates or formats, and Audacity will convert them automatically in realtime.
Summary of Changes in 1.3.11:
Bug fixes for:
Too much audio exported when exporting partial selections
Exports via FFmpeg corrupted if included metadata; M4A now supports metadata export
Nyquist plug-ins did not add labels to an existing label track
Crash opening Preferences when no audio devices available
Timer Record and Sound Activated Recording bugs
(Windows) Installer now installs correctly over previous Audacity versions
Miscellaneous crashes and interface issues