Here are some things to consider:
* Song Structure: The number of sentences might be influenced by the song's structure (verse-chorus, bridge, etc.).
* Lyrical Density: Some songs are lyrically dense, with many ideas and details packed into a few sentences. Others are more sparse and focused.
* Genre: Different genres have different conventions. Rap songs often have longer sentences than traditional pop songs.
* Impact: Short, impactful sentences can create a powerful effect, while longer sentences can build tension or provide narrative detail.
Ultimately, the number of sentences in a song should serve the song's overall purpose and aesthetic. It's more important to focus on clear, compelling, and memorable lyrics than a specific sentence count.