More LDS:

The Logic Chord track
In a Logic Pro project, you can access the Chord track in the global tracks. You can add chords to the Chord track and have all the Session Players in the project follow them, playing in sync with each other. You can add chord progressions to the Chord track, and create chord groups that you can copy or loop to reuse the same sequence of chords in different parts of the project.

[Linked Image from help.apple.com]

Region chords
Session Player regions can contain region chords. You can add and edit region chords, and you can choose a chord progression for a Session Player region.

When a Session Player region contains region chords, it follows those region chords rather than the chords on the Chord track. You can also have a Session Player region follow the Chord track instead of its region chords. You can copy and paste chords between regions, paste chords from the Chord track to a region, and paste region chords to the Chord track.

[Linked Image from help.apple.com]