This software is for non-technical people who just want to listen to their music.
All essential features work out of the box, at worst you might have to show Boom where your music folder is.
There are many "easy" apps aiming at the same, they're usually bloated, buggy, or worse. Boom has none of this, it's a self-contained 2.5MB Windows executable.
It was forked from foobar2000 codebase around year 2010, which means it's lightweight, stable and runs on your grandma's solitaire-only PC.

What Boom does

• No installation or administrator rights required! Just download and run.
• Gapless playback of properly encoded files. Enjoy smooth transitions between tracks.
• ReplayGain support.
  External software is currently required to write ReplayGain information to file tags to utilize this functionality.
• Contents of your music folders are shown, in a convenient structured genre/artist/album/song view.
  By default, contents of "my music" folder or Windows Music library folders are shown. You can configure Boom to index music from any other folders though.
  You can install Boom to removable media and have it index contents of the folder it is installed in.
• Are your files badly tagged or missing tags altogether? No problem, Boom can browse your music library by its folder structure.
• Supports variety of popular audio formats, including: MP3, Ogg Vorbis, Opus, FLAC, Musepack (MPC), WavPack, WAV, AIFF, MP4/M4A, WMA.
• For emergency tagging needs, Boom includes a simplified version of the foobar2000 Properties dialog.
• Easily configured to run from removable media.
• Multilanguage support.
  Boom will pick one of the built-in localizations depending on your system language.
  You can translate it to your language - using localization template - and submit the language file to be included with the next Boom update.
  To submit your translations, join #boomaudio on irc.libera.chat.

... and what it does not do

• Require installation or administrator rights
• Access the internet
• Read audio CDs
• Integrate with Windows Explorer

Latest version

System requirements

• Windows 7 or newer required for full functionality.
• Windows XP or newer supported with limited features.
  AAC decoding requires Microsoft codecs included with Windows 7

Need help? Join #boomaudio on irc.libera.chat.