https://fr.m.wikipedia.org/wiki/Karine_Deshayes

https://en.m.wikipedia.org/wiki/Saverio_Mercadante

Source: Amazon.com: Donizetti: Don Pasquale / Act 3 – “Senz’andar lungi…La morale in tutto questo” (Live At Metropolitan Opera House, New York / 2011): Anna Netrebko & Juan Diego Flórez & Mariusz Kwiecien & Simone Alaimo & Metropolitan Opera Orchestra & Maurizio

https://en.m.wikipedia.org/wiki/Scott_Bradlee

https://en.m.wikipedia.org/wiki/Postmodern_Jukebox

https://en.m.wikipedia.org/wiki/Ernesto_De_Curtis

https://en.m.wikipedia.org/wiki/L%C3%A9o_Delibes

In music theory, a natural is an accidental which cancels previous accidentals and represents the unaltered pitch of a note.^[1]

A note is natural when it is neither flat (♭) nor sharp (♯) (nor double-flat  nor double-sharp ). Natural notes are the notes A, B, C, D, E, F, and G represented by the white keys on the keyboardof a piano or organ. On a modern concert harp, the middle position of the seven pedals that alter the tuning of the strings gives the natural pitch for each string.

The scale of C major is sometimes regarded as the central, natural or basic major scale because all of its notes are natural notes, whereas every other major scale has at least one sharp or flat in it.

The notes F♭, C♭, E♯, B♯, and most notes inflected by double-flats and double-sharps correspond in pitch with natural notes; however, they are not regarded as natural notes but rather as enharmonic equivalents of them and are just as much chromatically inflected notes as most sharped and flatted notes that are represented by black notes on a keyboard.

https://en.m.wikipedia.org/wiki/Natural_(music)

https://en.m.wikipedia.org/wiki/Bejun_Mehta

Christoph Willibald (Ritter von) Gluck (German: [ˈkʁɪstɔf ˈvɪlɪbalt ˈɡlʊk]; 2 July 1714 – 15 November 1787) was a composer of Italian and French opera in the early classical period. Born in the Upper Palatinate (now part of Germany) and raised in Bohemia,[1] he gained prominence at the Habsburg court at Vienna, where he brought about the practical reform of opera’s dramaturgical practices that many intellectuals had been campaigning for over the years. With a series of radical new works in the 1760s, among them Orfeo ed Euridice and Alceste, he broke the stranglehold that Metastasian opera seria had enjoyed for much of the century.

Source: Christoph Willibald Gluck – Wikipedia

In classical music from Western culture, a third is a musical interval encompassing three staff positions (see Interval number for more details), and the major third ( Play ) is a third spanning four semitones. Along with the minor third, the major third is one of two commonly occurring thirds. It is qualified as major because it is the larger of the two: the major third spans four semitones, the minor third three. For example, the interval from C to E is a major third, as the note E lies four semitones above C, and there are three staff positions from C to E. Diminished andaugmented thirds span the same number of staff positions, but consist of a different number of semitones (two and five).
https://en.m.wikipedia.org/wiki/Major_third

In the music theory of Western culture, a minor third is a musical interval that encompasses three half steps, or semitones. Staff notation represents the minor third as encompassing threestaff positions (see: interval number). The minor third is one of two commonly occurring thirds. It is called minor because it is the smaller of the two: the major third spans an additional semitone. For example, the interval from A to C is a minor third, as the note C lies three semitones above A, and (coincidentally) there are three staff positions from A to C. Diminished and augmented thirdsspan the same number of staff positions, but consist of a different number of semitones (two and five). The minor third is a skip melodically.
https://en.m.wikipedia.org/wiki/Minor_third