The study is being conducted to see which cardiac tests that monitor how the heart functions during and after treatment with anthracyclines are most effective. This study will assess a new way to check the heart function of children during and after cancer treatment. Currently, doctors use echocardiograms (heart ultrasound) to see how the heart is working. Echocardiograms are currently being done as part of standard of care prior to giving anthracycline chemotherapy doses and if any cardiac problems are suspected. The new method involves Cardiac Magnetic Resonance Imagining (CMRI) and a blood tests for certain biomarkers for heart health: High sensitivity troponin, Caspase, C-reactive Protein (CRP), ventricular derived B-type natriuretic peptide (BNP), Matrix Metalloproteinases (MMPs), Tissue inhibitors of metalloproteinases (TIMPs), C terminal propeptide of type I procollagen (PICP), C terminal telopeptide of collagen type I (CITP), Troponin I, and Bone Alkaline Phosphatase. The purpose of this study is to find out if CMRI and blood tests help us to find heart problems earlier, before they are detected by echocardiograms.