PotPloyer, my personal favorite videoplayer (and part the "trinity"), does play audio and it reduces the size of it's window considerably to show you the necessary buttons and info about the track currently playing.
Having said that, fOdder's recommendation to play audio is better. Some like their tools to include "everything and the kitchen sink", some like tools that do one job and do it well.
Try out any of the "trinity" of video-players, you hardly go wrong with any. Each of them do not require you to install codecs at all to play video's or audio, no matter the format of the video/audio file. Personally I enjoy using the foobar2000 music player, mainly because it sounds excellent, but it also gives you options to add plug-ins to complement the already available tools and you can change its interface to how you like it.