回答：《happy new year》是 Justin Bieber演唱的歌曲，是justin bieber和其好友Jaden Smith通过推特送给粉丝2012年的第一支新年歌曲。
延伸：
贾斯汀·比伯是欧美乐坛窜红速度最快的少年歌手，其单曲MV《Baby》YouTube全球视频点击超过六亿全球排行第一。
他创造了流行乐史上首位在18岁前拿下张冠军专辑的歌手，首张专辑发行前就有4首TOP40单曲的记录。单曲Mistletoe刷新了iTunes圣诞单曲最快夺冠记录。在“2011年福布斯全球百位巨星排行榜”上贾斯汀名列第三。
参考资料来源：百度百科-happy new year
happy牛year是happy new year是什么的谐音。意思是新年快乐。同时也是一首同名英文歌的名字。歌词如下：
Girl it's almost the new year, and its too clear, me you and a RootBeer, Float
In my house 'bout to count down cause we got the whole crew here
Yo they bout to party hardy. lookin for a hottie with a nice body
Ooh ya'll have fun with that we dont need the mistletoe we was under that like 20 minutes ago
And if you can give me all your love you better give me some more
The new years commin you aint trippin no more
So I dont need music bout to listen to yo'h-h-h-h-h heart beat
Try to stop me if you want to but you know you dont want to
So don't do it, dont ruin the moment I put me and you in
It's the start of the new year, baby, baby yeah
And I know what to do with it, baby baby yeah
Im gonna make your cheeks red when I kiss your neck
Girl im never leavin cause you are the best baby
Yeah yeah. I wanna give you everything
Never feel 'cause girl you're coming home with me, yeah
意义之一：Happy new year.英语是新年快乐的意思。
意义之二：汉语中的“牛”的发音和英语中的New很接近，今年恰逢牛年，所以就变成happy牛year了。意思是牛年新年快乐的意思。当然也有很牛气很福气的一年的意思了！
您满意吗！