What is the fine-grained topic of the following text: Another highlight of the movie is an extremely robust Holi number "Sa ra ra ra rang barsaye chhailva..." in which Anupam Kher, Gulshan Grover and Satish Shah join Udit Narayan, Roop Kumar Rathod, Kalpna and Tarannum, in sheer fun. Only return the topic.
A Holi song in a movie featuring various actors and singers.