Wondering what non-free drivers and software I installed on your Pi? Don't believe crazy theories on the Interwebzes, consult an expert like Richard Stallman:

sudo apt install vrms

then:

vrms

             Non-free packages installed on jessie-rpi

bluez-firmware                      Firmware for Bluetooth devices
firmware-atheros                    Binary firmware for Atheros wireless cards
firmware-brcm80211                  Binary firmware for Broadcom 802.11 wireless
firmware-iwlwifi                    Binary firmware for Intel Wireless cards
firmware-linux-nonfree              Binary firmware for various drivers in kernel
firmware-ralink                     Binary firmware for Ralink wireless cards
firmware-realtek                    Binary firmware for Realtek wired and wireless network
nikto                               web server security scanner

             Contrib packages installed on jessie-rpi

premail                             An e-mail privacy package.

  8 non-free packages, 0.4% of 1880 installed packages.
  1 contrib packages, 0.1% of 1880 installed packages.

Robo Stallman actually missed the encrypted DVD decoder from http://www.deb-multimedia.org/ and I'm pretty sure MP3 is still proprietary, but safe to say I'm at least 99% free software. ;)

Speaking of deb-multimedia's repository, they have ARMHF packages for several audio players including Audacious which can be skinned like the popular Windows program Winamp. I even ran across a couple I had never heard of before like the lean-and-mean DeaDBeeF and what's likely going to be the default in the next version of Privacy Enhanced Linux, Foobnix. It's a bit of a resource hog but it also integrates extremely well into the XFCE desktop. By default it displays cover art from the tray icon and pops up playback controls with a right click. Instructions on their site didn't work for me though, I had to
wget https://www.deb-multimedia.org/pool/main/d/deb-multimedia-keyring/deb-multimedia-keyring_2016.3.7_all.deb
and
sudo dpkg -i deb-multimedia-keyring_2016.3.7_all.deb
before editing /etc/apt/sources.list to add
deb http://www.deb-multimedia.org stable main non-free
you can then update apt and install foobnix. It does Internet radio better than Quod Libet too, so really don't see the need for both. I'm still testing it though so we'll see.