Love Musicbee, have been using it for years. I don't know how you manage to spend this much time on it, without making money. Either way, thank you. Now for the nitpicking.
The repeat button looks like Windows minify and is almost in the same position. It should probably be an arrow if you want to suggest linear playback. Similarly when repeat is ON it should be a
circling arrow to suggest a repeating movement.
The shuffle button cannot be understood until you turn on shuffle. It's just two lines. Even knowing the function it's hard to understand what is being suggested here. No one wants to learn what buttons mean by having to use them. Those icons should be self-explanatory or not icons at all. Use text instead, it's a much undervalued option.
The shuffle options have
Autoplay thrown in. I understand that it's technically weighted shuffling. But
to a new user it's not clear what Autoplay is at all. Much less what that icon means. Is it a pair of headphones? Autoplay requires further explanation and then a settings screen which has to be digged up elsewhere. I wonder if it should be up there at all (I never use it, my experiences with it were underwhelming) but it should have its own explanatory button at least.
What's missing is a
Shuffle All option, that shuffles through the complete library regardless of my current queue.
Source: Am web frontend dev.