Ketapop, chillrave[0] - I find they have the right amount of ambience and novelty to not be too boring to make you drowsy or too interesting to be distracting so they can peacefully sit in the background all day long giving you a bit of rhythm but also letting you focus.

[0]: https://soundcloud.com/gina-sabatini/kitti-mimizan-b2b-gina-...