Moo0 Audio Player is a very simple audio player.
It is very small and simplified for easy use. If you are looking for a lightweight audio player, this may be the one for you.
Also, it includes skins in various colors to suit your liking.

Tips:
Want better sound? - Please try out "Effect -> Open Air".
Wondering about the Skins? - You can check them out here.
Want to equalize volume among songs? - Use "Individual Volume" menu by right-clicking each song.
[Space Key / Period(.)] - Play / Pause
[U/D Arrow Key] - Volume Up / Down
[L/R Arrow Key] - Go Previous / Next Song
[Control + L/R Arrow Key] - Seek Back / Forward in Current Song
[Del Key] - Remove selected items
[Double-Click] - Show / Hide Play List
[Middle-Button Click] - Iconize Player