halberd made "long ago." available on August 5, 2017. The duration of long ago. is about two minutes long, specifically at 2:06. This song does not appear to have any foul language. long ago.'s duration is considered a little bit shorter than the average duration of a typical track. Because this song is the only song in long ago. and no other songs are present in the album, we classify this track as a single. The popularity of long ago. is currently average in popularity right now. Even with the track produces more of a neutral energy, it is pretty danceable compared to others.

long ago. テンポ

We consider the tempo marking of long ago. by halberd to be Vivace (lively and fast) because the track has a tempo of 163 テンポ, a half-time of 82テンポ, and a double-time of 326 テンポ. Based on that, the speed of the song's tempo is fast. The time signature for this track is 4/4.

long ago. キー

This song is in the music key of C Minor. Because this track belongs in the C Minor key, the camelot key is 5A. So, the perfect camelot match for 5A would be either 5A or 4B. While, a low energy boost can consist of either 5B or 6A. For moderate energy boost, you would use 2A and a high energy boost can either be 7A or 12A. However, if you are looking for a low energy drop, finding a song with a camelot key of 4A would be a great choice. Where 8A would give you a moderate drop, and 3A or 10A would be a high energy drop. Lastly, 8B allows you to change the mood.