foobar2000 is an advanced freeware audio player for the Windows platform.

Main features:

• Supported audio formats include: MP3, MP4/M4A, CD Audio, WMA, Vorbis, Opus, FLAC, WavPack, WAV, AIFF, Musepack.
• Gapless playback.
• Advanced tagging capabilities.
• ReplayGain support.
• Customizable keyboard shortcuts.