What are the classic or noble grape varieties used in making wine?

Q: What are the nine classic or noble grape varieties used in making wine?

A: Depends on which wine expert you ask.

Here are the nine most common grape varieties referred to as classic: Cabernet sauvignon, Chardonnay, Chenin blanc, Merlot, Pinot noir, Riesling, Sauvignon blanc, Semillon, Syrah

There's also a more exclusive group referred to as "noble" grape varieties, of which there are six.

White noble grapes: Sauvignon blanc, Riesling, Chardonnay

Red noble grapes: Pinot noir, Cabernet sauvignon, Merlot