Recs.
Updated
AIMP is an audio player only, created by Russian main programmer Artem Izmaylov and a staff of collaborators from Russia.
It's freeware and it's available for Windows XP SP3 and newer.
There is also a build for Android 4.x and newer.
SpecsUpdate
Pros
Pro Supports audiophile-level playback quality
Other music players usually require separate plugins for this, but AIMP comes by default with the modern WASAPI (Windows Audio Session API) audio output support thus providing purest sound output unadultered by the Windows mixer (in WASAPI Exclusive mode) out of the box.
Pro Tag Editor + Audio Converter can carry out a multitude of tasks
AIMP has two tools for further music management.
Tag Editor lets you add album art to audio files, fix metadata to individual files or to all files included in a folder, rename filenames, complete tags from filenames and viceversa, and more.
Audio Converter lets you convert an audio file into another format (for instance, from FLAC to M4A). You can choose quality parameters, renaming of files, and output paths for converted files. Audio conversion supports multiple core encoding, so if your CPU has four cores, you can convert audio using 1, 2, 3, or 4 cores.
Pro DSP manager allows for sound effects
AIMP has a digital sound processor manager which lets you apply sound effects to the output audio in real-time. These effects include: echo, reverberation, Flanger, Chorus, bass, enhancer, speed, tempo, and pitch. It also has a voice remover feature for stereo audio files.
Pro Multiple other features
AIMP has many more features including: dither, anticlipping, customizable hotkeys/shortcuts, customizable player's user agent string, access to Favorites audio files and playlists, rating for tracks, tracklist export, optional temporary information bar with track info every time a track begins, volume normalization, ReplayGain support, volume fading between tracks, and more.
Pro Allows for radio capture
AIMP can grab internet radios' audios and save them to drive, in real-time. You can save the streaming in its original format, or choose the codec manually [AAC, OGG Vorbis, OPUS, etc] and its bit rate. You can even save its CUE log and split files, if desired.
Pro Support for several WinAmp's plugins
AIMP supports several plugins originally designed for WinAmp. However, it also supports new plugins designed for AIMP itself. From visual plugins to extra codec support, YouTube playlists playback, Soundcloud playback, or spectrum analysing, these are a selection of supported plugins.
Cons
Con Cluttered and confusing interface
The interface is very busy and not intuitive so it can take a while to become familiar with it. The skins don't conform to specific design standards so they often have different behaviors. You can read more about it here.