People were like "Uh, no" when the song were first released in the movie "Despicable Me 2" but hey, looks at where the song bring the Happy Man, Pharell Williams, now. 

2. "I'm Yours" by Jason Mraz

Take it from the man who just want to be happy when doing his music. In one of his interview, he did say the last thing that he want to do is have a show and ask people, "Hey, everybody, I want you to come down with me for a second while I bum you guys out.". I watched his concert before and I remembered came out from the concert with a big smile on my face. =)

3. Shake It Off by Taylor Swift

I love Tay Tay more and more ever since her new album 1989 came out. Like what the lyric says, the sick beat will make you feel so happy and powerful. After all, haters gonna hate, right? 

4. Someday by Rob Thomas

My all time favourite in the karaoke session. This song is not considered new but the lyric really inspires and gives you hope to see the light at the end of the difficulties. 

5. Just The Way You Are by Bruno Mars

Loving yourself just the way you are is a sure way to lift up your mood. When Bruno says it, who are we to deny? We are amazing just the way we are, peeps!