Guayadeque is an excellent music player for managing large libraries; it is Free Software, licensed under the GNU GPLv3. This tutorial explains how to install the GTK music application Guayadeque on Arch Linux. Required packages may be obtained from pacman and the AUR.
yaourt -S guayadeque
Next you must install the gstreamer codecs in order to play music.
pacman -S gstreamer --needed $(pacman -Ssq gst-plugins)
Guayadeque should now be working properly: