There are many alternatives to iTunes for Mac and since it's discontinued a lot of people are looking for a replacement. The best Mac alternative is Swinsian. It's not free, so if you're looking for a free alternative, you could try Floola or JakPod. If that doesn't suit you, our users have ranked more than 100 alternatives to iTunes and three of them are available for Mac so hopefully you can find a suitable replacement.
Swinsian is a sophisticated music player for macOS with wide format support, folder watching, advanced tag editing and designed to be responsive even with the largest libraries.
Floola is a freeware application to efficiently manage your iPod or your Motorola mobile phone (any model supporting iTunes except iPhone and iPod touch). It's a standalone application that can be run directly from your iPod.
JakPod is a small java application to manage your iPod without having iTunes installed. You can clone, backup, repair, reorganize, analyze and manage your iPods or iPhones (up to 3rd Gen).
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Swinsian just works. You add music files to it and it plays them. Doesn't move them, doesn't crash, doesn't complain. Very easy to build playlists which also don't just disappear. Swinsian just helps you listen to music in a simple and easy environment, while allowing you to build playlists as you go.