Chillhop is the fusion of chill out music and hip hop. It's not trance. It's not smooth jazz. It's not electronica. It's chillhop and is by far my favorite music to listen to while coding. Doesn't distract. Doesn't compete for my attention. Doesn't amp me up (usually I code better when relaxed). Here's my favorite YouTube channel of it. A modern phenomenon is for people to code and study while being on the same Chillhop live stream and just chatting with each other randomly while taking breaks. It's sort of an online perpetual study group.