VLC is a free and open source video player but I use it for music and sounds too. It plays mp3, wav, ogg, flac, ac3, mp4, avi, divx, ogv, webm and most other multimedia files as well as DVDs, Audio CDs, VCDs, and various streaming protocols. It is also cross-platform. Subscribe to brand software basics, hacks & showcases: http://bit.ly/OSBsub
https://www.videolan.org/vlc/index.html
Simple, fast and powerful. Plays everything - Files, Discs, Webcams, Devices and Streams. Plays most codecs with no codec packs needed - MPEG-2, MPEG-4, H.264, MKV, WebM, WMV, MP3. Runs on all platforms - Windows, Linux, Mac OS X, Unix, iOS, Android. Completely Free - no spyware, no ads and no user tracking.