1. Sakura no Hanabiratachi - Classic. I just love the song and the PV.
2. Namida Surprise - This song is always stuck in my head, plus I love watching the PV.
3. Beginner - I always listen to this song whenever I work out, it's a good motivator to do anything (along with River)
I also love basically all the summer singles, they always make me happy for some reason. Also, UZA has recently become one of my favorites.