Apple - Looking for a lightweight MP3 player for OS X

If you prefer a dedicated app rather than use Quick Look, check Vox, the lightweight music app for Mac OS X.
It's free but you can donate.

Quicktime player. Quicktime player.

I've been looking for the perfect lightweight OSX player for a long time and still stick with Cog

Change the update feed to Nightly in the preferences and you'll get 0.08 that runs in High Sierra and lower.

UPDATE: An active fork is now available at https://kode54.net/cog (thanks OleGG for the mentioning it)