<p>IIRC, on the Common Ap you simply self-report your ECs, so I would assume this is up to you. THE ABRSM certification is not common (although not unheard of in the US) and is more common internationally, so why not? I think part of the challenge of the Common Ap is trying to figure out where your own specific ECs and awards fit into their category so that the adcoms can get a clear idea of who you are at a glance.</p>