It's a software dressed in a barrel held up with suspenders. Also, this is my first Mac, and it will be my last. Nightingale appears to be par for the course as far as applications on Mac go.
The only reason I gave this 1.5 stars is because the idea for the GUI interface was simple and had a solid idea behind it. Other than that, this is what is wrong (everything):
-Many of the songs do not play with an error message stating that the files are corrupt. They are not. They work fine in other apps. Also, many songs have added gaps of blank space in them.
-The album art cache only displays once upon pasting an image to an audio file.
-The metadata editor does not actually edit song data for the staggering majority of files.
-It's unsupported. There will be no updates to fix these bugs. I guess that's just because it's freeware (a rarity on Mac).
-Occasionally, Nightingale will crash entirely.
I can go on. I found Nightingale on a list of best alternatives to iTunes, and many of the other apps are garbage as well. I was so motivated by my distaste of these apps that I had to make an account here just to leave soggy reviews.
Did I mention that I don't like Mac?