Getting count and quantity on combined columns

I need help with this query
this is the database


Location, Quantity, Purpose, Cable

EX:
Atlanta, 2, March Concert, xlr_50ft
Chicago, 3, July Concert, rca_25ft
Atlanta, 1, March Concert, xlr_25ft
Atlanta, 5, March Concert, rca_15ft

If given we want the 'March Concert', i need the query to return

8, Atlanta

but maybe i'm just stupid and this is really easy but I can't think of this right now at 8 o'clock on friday night, any help?

select sum(quantity), purpose
from <table>
where purpose = 'March Concert'
group by purpose

select sum(quantity) as TotalQuantity, Location
from <mytable>
where purpose='March Concert'
group by Location