Henry Edward Krehbiel was an American music critic and musicologist who helped to make opera more popular and more understandable.Contents:The Barber Of SevilleThe Marriage Of FigaroThe Magic FluteDon GiovanniFidelioFaustMefistofeleThe Damnation Of FaustLa TraviataAidaDer FreischutzTannhauserTristan And IsoldeParsifalThe Messenger Of NurenbergLohengrinHansel And GretelIrisMadam ButterflyDer Rosenkavalier.