Invisible Cities, by A Winged Victory for the Sullen is my current go-to working album of choice. One of those albums that I've listened to dozens of times, but only through looking it up for this post did I learn its original context: 'the stunning score to the critically acclaimed theatre production directed by London Olympics ceremony video designer Leo Warner'.
I have a playlist which contains a long run of music like this, plus some other soundtracks and weirder ambient music. At current count, it's 13 hours long. I do occasionally prune and rearrange things, and it's certainly not designed to play all the way through, but it's a decent catalogue of music into which my brain can disappear fairly reliably.