yu-yu's 'Happy Birthday' came out on December 1, 2011. With Happy Birthday being less than two minutes long, at 1:36, we are fairly confident that this song is not explicit and is safe for all ages. Based on the duration of this song, this song duration is much smaller than the average song duration. The track order of this song in yu-yu's "Melody of yu-yu -winter-" album is number 3 out of 3. On top of that, Japan appears to be the country where this track was created. In terms of popularity, Happy Birthday is currently unknown. Although the tone can be danceable to some, this track does projects more of a negative sound rather than a postive one.

Happy Birthday テンポ

We consider the tempo marking of Happy Birthday by yu-yu to be Andante (at a walking pace) because the track has a tempo of 96 テンポ, a half-time of 48テンポ, and a double-time of 192 テンポ. Based on that, the speed of the song's tempo is slow. The time signature for this track is 4/4.

Happy Birthday キー

The music key of this track is D♭ Major. This also means that this song has a camelot key of 3B. So, the perfect camelot match for 3B would be either 3B or 4A. While, 4B can give you a low energy boost. For moderate energy boost, you would use 12B and a high energy boost can either be 5B or 10B. Though, if you want a low energy drop, you should looking for songs with either a camelot key of 3A or 2B will give you a low energy drop, 6B would be a moderate one, and 1B or 8B would be a high energy drop. Lastly, 12A allows you to change the mood.