I think it depends on the context. Calming music tends to lower heart rate. An 8 Hz difference in tuning is unlikely to cause significant interest. Most folks

I think it depends on the context. Calming music tends to lower heart rate. An 8 Hz difference in tuning is unlikely to cause significant interest. Most folks don't have ears trained well enough to discern pitch from memory. But, the music would sound slightly "off". Given that it's a slight down-tuning, it would sound a little moodier. We are bombarded by music every day. Muzak, background music, etc. Many of us don't even realize we are hearing it anymore, because our minds filter out things that aren't relevant. Novelty, however, can bypass this filter. That's likely what is at play here.