What is the function of these Apple Music buttons?

Begin Autoplay

Repeat the currently playing song

Repeat all songs in the current view (e.g., playlist)

Turn shuffle on

Also see: Shuffle or repeat songs in Music on Mac - Apple Support

and Add music to your queue to play next on your iPhone, iPad, iPod touch, or Android device - Apple Support

Autoplay (Automatically Generate a playlist based on this song to keep playing. Similar songs will be added to the queue)

Repeat the select song.

Repeat the playlist or song list currently being viewed.

Shuffle the playlist or song list.

click here ➜ Symbols used in Music on Mac - Apple Support