I love the Eno track (with Robert Wyatt on piano), but it's quite antsy (probably because it replicates the kind of tension you experience waiting for a flight).

The best song to prepare an anxious mind for the writing process (should be played before not during the process) is Structures from Silence. by Steve Roach. https://youtu.be/AsIjyJvhR9A?si=XqAwaY6PMQDEhz-j