I have seen many different opinions regarding the usefulness of, say, having a radio program on in the background while you work, do chores, etc. Some say that simply being able to hear the sounds and rhythm of the language will help promote further growth with listening comprehension (when responsibly paired with actual study and "active" listening at a later point), while others say that the only useful practice is "active" listening practice, where you sit down and listen with the intention of 100% comprehension of the sounds you're hearing.
Is there any evidence to promote either viewpoint one way or another?