A song that makes you listen blankly: Days Gone By

The key point is that it flows naturally without a complex structure. The vocals also sound relaxed, making it more comfortable to listen to. The chorus isn't overpowering, but it's the type that sticks in your head. The band sound isn't excessive, so it's great to listen to as background music. Just having it playing makes time feel like it slows down, so I've been listening to it often lately.