You should also consider the app’s interface.
The best music player for Mac supports all types of files for the music you own, no matter how odd or niche those file types ultimately are. MP3 is just the tip of the iceberg there’s also MP4, FLAC, AAC, and plenty more. Scour the internet and you’re bound to find even the most current music from reputable download sources. Though we tend to think of streaming as the default method for listening to music, downloading files is still incredibly popular.
