As an alarm, or you would play it every morning when you woke up?
I could NEVER do that, because if I use a song as an alarm for an extended period of time, I will grow to despise the song and never bare to listen to it because it reminds me of the torture of being woken up and having to get up when I want to sleep. So I usually use preset ringtones or use songs that I like but pay dust to and never listen to anyway.