I use Winamp, but now use Foobar2000 almost exclusively. It has better support and can play high end audiophile formats. Multiple playlists, Equalizer, lightweight and minimalistic. I don't use album arts and metadata, so ymmv. You might need some addons to support that.
I just want to add my music files/folders and play.
If you want better GUI and extra fluff, try Groove and iTunes for Windows. If you purchased music through iTunes, you may be stuck with it since they have DRM. You need iTunes and then sign into your Apple Account to play them. This is why I use DRM free music cause I can play them anywhere in any software that supports the format on any platform.