“New York has few intimate and acoustically appealing halls in the 250-seat range. The Morgan is hoping that its handsome space — designed, like the pavilion, by the architect Renzo Piano — will become a valuable resource. It usually takes concertgoers (this one, at least) time to assess the acoustics and qualities of a new hall. But it’s clear from the get-go that this one will be welcomed by the music lovers in the city.”