A rehearsal is a structured repetition of a track or piece with the performers until eventually it could be sung or performed correctly and, if it is a song or piece for more than one musician, until eventually the areas are alongside one another from a rhythmic and tuning standpoint. https://m.canvas.umich.edu/eportfolios/1905/Home/Tubidy_Review__Is_Tubidy_a_Good_Video_Streaming_Service