[4]All other voices were normally calculated in relation to the tenor, which often proceeded in longer note values and carried a borrowed Cantus firmus melody.However, the role of Rodrigo di Dhu (written for Andrea Nozzari) in Rossini's rarely performed La donna del lago is defined as a tenor but requires an A♭2.Some, if not all, of the few top Cs in the standard operatic repertoire are either optional—such as in "Che gelida manina" in Puccini's La bohème—or interpolated (added) by tradition, such as in "Di quella pira" from Verdi's Il trovatore); however, the highest demanded note in the standard tenor operatic repertoire is D5, found in "Mes amis, écoutez l'histoire"[6] from Adolphe Adam's Le postillon de Lonjumeau and "Loin de son amie"[7] from Fromental Halévy's La Juive).In SATB four-part mixed chorus, the tenor is the second lowest vocal range, above the bass and below the alto and soprano.The typical leggero tenor possesses a range spanning from approximately C3 to E5, with a few being able to sing up to F5 or higher in full voice.Voices of this type are utilized frequently in the operas of Rossini, Donizetti, Bellini and in music dating from the Baroque period.The lyric tenor is a warm graceful voice with a bright, full timbre that is strong but not heavy and can be heard over an orchestra.There are many vocal shades to the lyric tenor group, repertoire should be selected according to the weight, colors, and abilities of the voice.Some dramatic tenors have a rich and dark tonal colour to their voice (such as the mature Enrico Caruso) while others (like Francesco Tamagno) possess a bright, steely timbre.The keystone of the heldentenor's repertoire is arguably Wagner's Siegfried, an extremely demanding role requiring a wide vocal range and great power, plus tremendous stamina and acting ability.[10] In French opéra comique, supporting roles requiring a thin voice but good acting are sometimes described as 'trial', after the singer Antoine Trial (1737–1795), examples being in the operas of Ravel and in The Tales of Hoffmann.