Voted for other:

Robbie Hart Band
Teddy Castellucci ... Himself (or herself as required)

It depends on what the actual film credits looked like, but a role should always be included.

Quoting ya_shin:

Quote:
I voted for "Something Else".

Use of dividers, if the credits suggest it, is fine with me, but I would always add the role according the divider, only modified to remove plurals.

This option:
Use Divider and Use Group Name for Role followed by "Member"
does not represent that properly. Adding "Member" is adding non-existent data and may not always be appropriate.

EDIT:
Hmmm, I voted according the thread title, rather than the opening post. If we are talking about a band appearing in the film, then I would do it as suggested by Rick.

Sounds fairly reasonable to me.

Quoting RHo:

Quote:
I would not use dividers for group roles at all. Dividers and group roles are completely different animals (at least from database point of view).

You are a very wise man, RHo 

First off, regardless of whether to use a divider for these, I'd like to say that I'm not a big fan of "inventing" data, like adding "Member" as is done in some of these examples. On-screen, we see "Robbie Hart Band", so that's what I use in my profile. Not "Robbie Hart Band Member" or "Member of Robbie Hart Band" or any other variant. I really don't see the need to do this: "Robbie Hart Band" seems just fine to me.

As for using dividers: I do like dividers, I really do, but I don't think we should become overly enthusiastic...    I tend to only use dividers if the actors under such a header are indivually credited. This isn't even a real header: it's just part of the regular cast list, with as only difference the fact that three actors share one role name. IMHO, each of those three actors should just get "Robbie Hart Band" as role name, and no divider is needed at all. I'll supply a screenshot (Martin's example is from 'The Wedding Singer'):



As you can see there's no real "header": it's just three cast members sharing the same role name. I see no need for using a divider. As others have pointed out: if this was a real band, using a band name divider with the members as themselves underneath would seem like an appropriate method. But this is fictitious, so in my database, I have simply entered it this way:

I agree with lyonsden5.

Now that I've seen the actual credits, I'd say no divider and each of the three people gets a rolename of "Robbie Hart Band".

This is why my initial response was: it depends.

Yeah, if there's no "divider" in the credits there shouldn't be one in the profile, either. I agree with what hal9g said: no divider and each of the three people gets a rolename of "Robbie Hart Band".