Jamie Barton serves up delicious recital at Wolf Trap Barns.

Opera-lovers often long for products of the old school. Jamie Barton, the mezzo-soprano who gave a recital at the Wolf Trap Barns on Friday night, is an example of the very best of the new one. Let me explain. The "old school" of opera nostalgia is full-throated, emotionally volatile terrain staked out by adjectives such as "fierce" and "demented." The new school leads singers through young-artist programs that seek to produce good colleagues and well-rounded multi-taskers who can produce a rang...