Darwin has been performing as a soloist in concert halls and with ensembles and orchestras all over the United States for over twenty years. Although he continues to perform much of the standard violin repertoire of concertos, sonatas and short pieces, in recent years he has specialized in resurrecting lost or rarely performed works of the late 19th and early 20th centuries. He has been sought after by other artists and musicians as an expert in these works, and his most recent projects in this area have been published online.