I agree with Veera

"Love song can also be relaxing for most of the people,as it is kind of sentimental,slow and smooth song,so it's can relax your mind body and souls." 

Yeah, it's true as sometimes when i listen to love song, that the time my body start to relax as well as my muscle. My mind will full with the love song and start to relax...

Sometimes when you're tired, you can just try to listen to some love song. It do work!