Bonus: Great DSP plugins

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Foobar2000 offers loads of great sound processing plugins.
For example, you can:

-Change the tempo, pitch, and speed of the playback (in real time and in two clicks) with foo_dsp_soundtouch

-Cut out the voice or the instrumental part (actually, the center, and side components; but in most recordings, the voice and the drums are center, and the rest is on the sides) with foo_dsp_centercut

-Simulate any reverberating environment (provided you have the impulse response) with the convolver

-Convert stereo to binaural...

-And finally, use any Winamp DSP plugin, with foo_dsp_winamp

A full list of DSP components here.