Is a music band a singular or a collective entity, grammatically speaking? [duplicate]

Duplicate:
Is the usage of “are” correct when referring to a team/group/band?

What is correct to say?

Korn* is a great band

OR

Korn* are a great band.

(* You can replace your favourite band's name here)

Of course everybody there is no doubt about the following sentences:

The Beatles are a great band

Led Zeppelin is a great band

But with certain kinds of names, the situation becomes difficult.

Metallica are a great band

OR

Metallica is a great band

Is there any consensus on this matter?

I think that in British English, The Korn are a great band is correct, while in American English, The Korn is a great band.

Again, I'm not sure, but Korn being made of a number of people, the plural might work.

As far as I can tell, band names are typically treated as a plural if the name of the band starts with "the" and is a plural noun or based around a plural noun -- or more generally, if it seems to be referring to its members as a collection of entities -- and a singular otherwise. So we would have:

• The Beatles are a great band.
• Korn is a great band.
• The Rolling Stones are a great band.
• Metallica is a great band.
• Led Zeppelin is a great band.
• Nine Inch Nails is a great band. (note that the plural noun does not control here)