A beautiful, fast, fluent, light weight music player..
Amberol
A small and simple sound and music player.
Qmmp
This program is an audio-player, written with the help of the Qt library. The user interface is similar to winamp or xmms.
Haruna
Haruna is an open source video player built with Qt/QML on top of libmpv.
Priis
Pragha is a Lightweight Music Player for GNU/Linux, based on Gtk, sqlite, and completely written in C, constructed to be fast, light, and simultaneously tries to be complete without obstructing the daily work. 
GMusicBrowser
A customizable open-source jukebox for large collections
Juk
JuK is an audio jukebox application, supporting collections of MP3, Ogg Vorbis, and FLAC audio files. It allows you to edit the “tags” of your audio files, and manage your collection and playlists. It’s main focus, in fact, is on music management.
Webamp
Bringing back Winamp!
Parole
Parole is a modern simple media player based on the GStreamer framework and written to fit well in the Xfce desktop.
Exaile
Simple interface. Powerful music management. Smart Playlists. Advanced track tagging. Automatic album art. Lyrics. Streaming Radio. Podcasts. Secondary output device support. Easily extensible with 50+ plugins available.