Audacious Media Player (Qt5-only)
Audacious is an advanced audio player. It is free, lightweight, based on Qt, runs on GNU/Linux and many other UNIX-like platforms, and is focused on audio quality and supporting a wide range of audio codecs. It still features an alternative skinned user interface (based on Winamp 2.x skins). Historically, it started as a fork of a fork of XMMS.
Source Files (show merged sources derived from linked package)