Patients with hypertrophic cardiomyopathy (HCM) have a gene mutation that results in excessive thickening of heart muscle. Due to this abnormality these patients often present with voltage changes on electrocardiograms (ECG) suggestive of abnormal electrical conduction. The use of magnetocardiography (MCG) in these patients has yet to be extensively studied. Magnetocardiography (MCG) is a safe, non-invasive, and FDA approved technology that can be used to detect weak magnetic fields generated by the heart. The goal of this pilot study is to determine common MCG findings in patients with HCM, while establishing the role that MCG has in the evaluation and treatment of these patients.