Rhabdomyosarcoma (RMS) is the most common soft tissue sarcoma in children and adolescents, with approximately 350 children diagnosed annually in the United States. Patients are divided into low, intermediate, and high-risk groups based on the characteristics of their disease. The overall goals of this study are: 1. To compare the effects, good and/or bad, of giving less chemotherapy drugs to people with VLR-RMS to find out which is better. This is Arm VLR-RMS of the study. 2. To find out how well people with LR-RMS as a group respond to standard chemotherapy when risk groups are refined so...