Foobar is an incredible lightweight music player with media database that can be configured to one's heart content and various plugins and addons are available. While it is a windows app, it works well under wine in Linux.

Start the installer using

wine foobar2000_v1.3.10.exe

Select portable installation and enter Z:\home\wuff\.foobar2000 as destination folder.

When prompted use the separate user-components folder.

It's not a terrible idea to make a backup before and/or after the upgrade of the foobar folder using

tar cvzf foobar2000.portable.linux.tgz ~/.foobar2000