Without Apple Music Paid Subscription, How Will I Play My Music Library When iTunes For Mac Goes Away?

I have all of my music on my hard drive (as well as an old iPod and external drive backups).

I have no plans to subscribe to Apple Music.

My music files in iTunes are in many different formats - lossy and lossless - and are sourced from many places - purchased from iTunes store, imported from CDs, downloaded from other legal sites, etc. 

In short, my iTunes plays and contains music files with many different file extensions.

iTunes for Mac is going away because Apple is replacing it with Apple Music, Apple TV, and Apple Podcasts. How do I continue to play and manage my entire iTunes music library without a subscription to Apple Music?

All my devices are Apple Mac OS or iOS.