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“Unchained” also highlights his skill as a vocal harmonizer, no small feat given Roth’s overwhelming cords.

The alto saxophonist Nick Mazzarella’s long tones, sometimes run through a harmonizer, are unnerving, rather than providing balance.

The soft rock harmonizers will revisit two of their most iconic albums during their first run at the Beacon in 23 years.

He first showed promise as a schoolboy soloist in the church choir and then as a harmonizer in barbershop quartets.

Says Robert Leicht, political commentator for the Hamburg weekly Die Zeit: ''I often disagree with Kohl, but I take it for granted he is a harmonizer.