I can't answer that,because I can't pick just one.I have too many that I like.Also if I heard that one song everyday,eventually it wouldn't be a পছন্দ of mine anymore.
It would probably be like Wii Shopping music, Pokemon Eterna Forest, (nonspecific) Zelda music, or...How Bad Can I Be? (Cantonese version). I've shared HBCIB a lot so I will provide আপনি with this beautiful song, for now xD
Someone beat me to Teenagers so I guess The Ghost Of আপনি দ্বারা My Chemical Romance. It's already basically on loop all the time. অথবা Helena. অথবা just Three Cheers For Sweet Revenge in general, I প্রণয় that album basically আরো than I প্রণয় myself.