Why do you have to sing some songs fast and other slow?

The tempo of a song—whether fast or slow—often reflects its emotional content, mood, and intended message. Fast songs can convey excitement, energy, or urgency, while slow songs typically evoke feelings of calmness, reflection, or melancholy. Additionally, the genre and structure of the song can influence its tempo, as certain styles lend themselves to faster or slower rhythms. Ultimately, the choice of tempo helps to enhance the listener's experience and connection to the music.