If you were looking for a free, small and trustworthy player, you've found it. It is called Moo0 AudioPlayer, an ultralight program with a minimal but attractive interface to which you can add colorful skins that suit your taste.
Moo0 AudioPlayer supports transparency controls and some sound effects that make it more attractive. It includes a list of musical themes, a volume control and the usual buttons on a music player (Play, Stop, Pause.).
The program, Moo0 AudioPlayer, is in English and Japanese. If you don't want to overload your hard drive with a heavy player, Moo0 AudioPlayer will do you a good service.
You can free download Moo0 AudioPlayer 32, 64 bit and safe install the latest trial or new full version for Windows 10 from the official site.