sigur Ros is a experimental post rock band quite soothing in my opinion
https://www.youtube.com/watch?v=8LeQN249Jqwalso if you're looking for more abrasive try gybe!
https://www.youtube.com/watch?v=JMDmaUO4hnoif you're not looking for rock i suggest listening to Hindustani classical music
https://www.youtube.com/watch?v=jZtlczq3yEsDISCLAIMER if you are not an easy listener listen from the last 15 minuets