wannasleep made "情書" available on July 18, 2021. With 情書 being less than two minutes long, at 1:40, 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. There is only one song in 大嘻哈時代, Vol. 3, so we believe that "情書" is a single. In terms of popularity, 情書 is currently below average in popularity. Even with the track produces more of a neutral energy, it is pretty danceable compared to others.
The tempo marking of 情書 by wannasleep is Andante (at a walking pace), since this song has a tempo of 93 BPM. With that information, we can conclude that the song has a slow tempo. This song can go great with yoga or pilates. The time signature for this track is 4/4.
The music key of this track is F♯ Minor. This also means that this song has a camelot key of 11A. So, the perfect camelot match for 11A would be either 11A or 10B. While, a low energy boost can consist of either 11B or 12A. For moderate energy boost, you would use 8A and a high energy boost can either be 1A or 6A. However, if you are looking for a low energy drop, finding a song with a camelot key of 10A would be a great choice. Where 2A would give you a moderate drop, and 9A or 4A would be a high energy drop. Lastly, 2B allows you to change the mood.
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