lofi hip hop seems to work pretty well, but there usually are three stages:
- I don't get into the groove despite the music
- Something clicks and I get into the groove
- I'm so deeply in the groove that even lofi hip hop bothers me, so I turn it off and go ham
Also I find it funny that lofi hip hop has an alternate title of "beats to relax/study to"--I used to listen to it while studying in college, but now I use it for working on personal projects or at work.
Lofi-girl helps me too, it's completely out of my traditional musical tastes but there's something in it that makes me start working. I also have to turn it off eventually though, I find I need to revert to silence after a while for some reason. And if I notice a beat or tune I've heard before, it can rip me out of concentration.
Yes it's hard to say. Sometimes it's when I feel like it's a natural time for a break, but also maybe whatever it is (that the audio tickles in my brain) becomes fatigued or used up.
Either way the silence gives a great feeling of relief. I sleep with a noise generator in my room and can't really do without it (tiny noises fill me with adrenaline at night) but when I wake up and turn it off my body loves me for returning the silence.
I use video game soundtracks. They tend to be designed to hit that sweet spot of easy to tune out but engaging enough to placate a distracted brain. A few I can recommend:
Samarost 3
Hundered Days
Far Lone Sails
Far Changing Tides
Obduction and Myst series
The Red Strings Club
Conspiravision (which is a remake of Deus Ex OST)
Hyper Light Drifter
I really like 'Groove Salad' from SomaFM for when I need to focus, it helps get me into a better flow state than anything else I've tried. However, there are times when I know I need to turn it on but don't/can't which is less helpful!