Rose-breasted Grosbeak, Pheucticus ludovicianushttp://en.wikipedia.org/wiki/Rose-breasted_Grosbeak
I really know very little about these guys. We actually do not see these often. However when we do, they are showy and interesting. They are actually large, about the size of an American Robin but heavier looking.
These are related to the Cardinalidae:, Cardinal Family.
They do sound very similar to the American Robin as well.