Happy Birthday's '君だったら' came out on March 1, 2013. With this song being about 5 minutes long, at 5:20, "君だったら" by Happy Birthday is fairly a long song compared to the average song length. This song does not have an "Explicit" tag, making it safe for all ages. There is only one song in 今夜きみが怖い夢を見ませんように, so we believe that "君だったら" is a single. Based on our statistics, 君だったら's popularity is below average in popularity right now. Although the tone can be danceable to some, this track does projects more of a negative sound rather than a postive one.

君だったら テンポ

The tempo marking of 君だったら by Happy Birthday is Allegro (fast, quick, and bright), since this song has a tempo of 138 テンポ. With that information, we can conclude that the song has a fast tempo. This song can go great with walking. The time signature for this track is 4/4.

君だったら キー

This song is in the music key of E Major. This also means that this song has a camelot key of 12B. So, the perfect camelot match for 12B would be either 12B or 1A. While, 1B can give you a low energy boost. For moderate energy boost, you would use 9B and a high energy boost can either be 2B or 7B. Though, if you want a low energy drop, you should looking for songs with either a camelot key of 12A or 11B will give you a low energy drop, 3B would be a moderate one, and 10B or 5B would be a high energy drop. Lastly, 9A allows you to change the mood.