Listen to lossless audio in Music on Mac
If you subscribe to Apple Music, you can play and download music encoded using the Apple Lossless Audio Codec (ALAC), which makes files smaller while preserving all the original data in the file. In Apple Music, lossless music is available in two formats:
Lossless: Up to 24-bit, 48kHz
Hi-Res Lossless: Up to 24-bit, 192kHz
Albums and songs available in lossless have the Lossless button 
next to them.
Note: Lossless music isn’t available in the Apple Music Voice Plan. Apple Music, Apple Music Voice and lossless aren’t available in all countries or regions. See the Apple Support article Availability of Apple Media Services.
Choose lossless audio quality preferences
In the Music app
on your Mac, choose Music > Preferences, then click Playback.Do any of the following:
Turn on lossless audio: Select the “Lossless audio” tickbox.
Select lossless audio quality when streaming songs: Choose one of the options from the Streaming pop-up menu.
Select lossless audio quality when downloading songs: Choose one of the options from the Download pop-up menu.
Change the lossless audio quality for a song
In the Music app
on your Mac, stream a song from Apple Music.Note: A song needs to be playing before you can change its audio quality.
Click the Lossless button
in the playback controls, then click Audio Quality Settings to change the lossless audio quality preferences.