[Avodah] Aveil as Sha"tz on Shabbos

[Daniel Israel]

rabbirichwolpoe at gmail.com wrote:
> The Teaneck Carlebach Minyan is hosting Shacharis-Mussaf. The ONLY
> Sha"tz around who knows the Carlebach Nusach is an aveil.
> 
> Q:
> Since "bemakom she'ein ish" would lich'ora be operable, does he step up
> and would now be construed as a "pro" in this context - and therefore
> be permitted to be Sha"tz?

I'm not sure I understand the case.  What is "hosting"?  Do they have a 
regular Shabbos minyan, or is this a special event, and if so, what is 
its purpose?

The reason I ask, is because I don't see why the Carlebach nusach is 
m'akev.  IOW, while ther sha"tz is required to daven the nusach of the 
shul, does that even extend to singing the Carlebach niggunim?  (And 
even if it did, what would be the din in a case where the shul was 
nusach Ashkenaz and the only person qualified to lead the davening was 
an aveil and someone who could only daven Sephard?)

That's why I'm assuming there is some other purpose, such as kiruv, 
which is driving the significance being given to the niggunim.  In which 
case the question is not in the sugya you are raising at all, it is 
whether that other factor (whatever it is) outweighs aveilus.

-- 
Daniel M. Israel
dmi1 at cornell.edu