X1 made "Hello" available on July 10, 2019. For a fairly short song, this song is "Hello" is considered an explicit song with a duration of 1:45. Because this song is the only song in Hello and no other songs are present in the album, we classify this track as a single. The popularity of Hello is currently unknown right now. The overall tone is very danceable, especially with its high energy, which produces more of a euphoric, cheerful, or happy vibe.

Hello テンポ

We consider the tempo marking of Hello by X1 to be Vivace (lively and fast) because the track has a tempo of 160 テンポ, a half-time of 80テンポ, and a double-time of 320 テンポ. Based on that, the speed of the song's tempo is fast. Activities such as, running, can go well with this song. The time signature for this track is 4/4.

Hello キー

The music key of this track is C Major. This also means that this song has a camelot key of 8B. So, the perfect camelot match for 8B would be either 8B or 9A. While, 9B can give you a low energy boost. For moderate energy boost, you would use 5B and a high energy boost can either be 10B or 3B. Though, if you want a low energy drop, you should looking for songs with either a camelot key of 8A or 7B will give you a low energy drop, 11B would be a moderate one, and 6B or 1B would be a high energy drop. Lastly, 5A allows you to change the mood.