Many patients with brain tumors require surgery. Some patients have brain tumors near important parts of the brain. These brain areas have roles in language or motor function. Avoiding these motor and language areas helps to prevent neurological deficits. The investigators are studying the parts of the brain involved in motor and language. Patients usually get functional MRI (fMRI) or resting-state fMRI (rs-fMRI) for gray matter mapping and diffusion tensor imaging (DTI) or diffusion spectrum imaging (DSI) for white matter mapping. These special MRI sequences are used to plan surgery. Patients are scheduled to have imaging to help plan for possible surgery.