In music, a ninth is a compound interval consisting of an octave plus a second.

Like the second, the interval of a ninth is classified as a dissonance in common practice tonality. Since a ninth is a larger than a second, its sonority level is considered less dense.

A major ninth is a compound musical interval spanning 14 semitones, or an octave plus 2 semitones. If transposed into a single octave, it becomes a major second or minor seventh. The major ninth is somewhat dissonant in sound.

Some common transposing instruments sound a major ninth lower than written. These include the tenor saxophone, the bass clarinet, the baritone/euphonium when written in treble clef, and the trombone when written in treble clef (British brass band music).

When baritone/euphonium or trombone parts are written in bass clef or tenor clef they sound as written.

A minor ninth (m9 or -9) is a compound musical interval spanning 13 semitones, or 1 semitone above an octave (thus it is enharmonically equivalent to an augmented octave). It is a type of extended minor seventh.^{[citation needed]} If transposed into a single octave, it becomes a minor second or major seventh. The minor ninth is rather dissonant in sound,^{[citation needed]} and in European classical music, often appears as a suspension. Béla Bartók wrote a study in minor 9ths for piano. The fourth movement (an intermezzo) of Robert Schumann's Faschingsschwank aus Wien, is a constructed to feature prominent notes of the melody a minor ninth above the accompaniment. Alexander Scriabin's sonata no. 9, 'black mass' is based around the interval of a minor ninth, creating an uncomfortable and harsh sound.

Ludwig van Beethoven (ⁱ/ˈlʊdvɪɡ væn ˈbeɪt.hoʊvən/; German pronunciation: [ˈluːtvɪç fan ˈbeːt.hoːfən] ( listen); baptized 17 December 1770 – 26 March 1827) was a German composer and pianist. A crucial figure in the transition between the Classical and Romantic eras in Western art music, he remains one of the most famous and influential of all composers.

Born in Bonn, then the capital of the Electorate of Cologne and part of the Holy Roman Empire, Beethoven moved to Vienna in his early 20s, studying with Joseph Haydn and quickly gaining a reputation as a virtuoso pianist. His hearing began to deteriorate in his late twenties, yet he continued to compose, conduct, and perform, even after becoming completely deaf.

Beethoven was the grandson of a musician of Flemish origin named Lodewijk van Beethoven (1712–73) who moved at the age of twenty to Bonn. Lodewijk (Ludwig is the German cognate of Dutch Lodewijk) was employed as a bass singer at the court of the Elector of Cologne, eventually rising to become Kapellmeister (music director). Lodewijk had one son, Johann (1740–1792), who worked as a tenor in the same musical establishment, and gave lessons on piano and violin to supplement his income. Johann married Maria Magdalena Keverich in 1767; she was the daughter of Johann Heinrich Keverich, who had been the head chef at the court of the Archbishopric of Trier.

David Tennant (born David John McDonald; 18 April 1971) is a Scottish actor. In addition to his work in theatre, including a widely praised Hamlet, Tennant is best known for his role as the tenth incarnation of the Doctor in Doctor Who, along with the title role in the TV serial Casanova (2005) and as Barty Crouch, Jr., in the film Harry Potter and the Goblet of Fire (2005).

Tennant was born in Bathgate, West Lothian, Scotland, the son of Essdale Helen (née McLeod) and The Rev. Alexander McDonald (known to family and friends as Sandy McDonald). He grew up with his brother Blair and sister Karen in Ralston, Renfrewshire, where his father was the local Church of Scotland minister. Tennant's maternal great-grandparents, William and Agnes Blair, were staunch Protestants from Derry in Ulster, the northern province of Ireland, and were among the signatories of the Ulster Covenant in 1912; William was a member of the Grand Orange Lodge of Ireland. Tennant's maternal grandfather, footballer Archie McLeod, met William and Agnes's daughter Nellie while playing for Derry City.

Wojciech Kilar (Polish pronunciation: [ˈvɔjt͡ɕex kilar] (pronounced phonetically: Voy-cheh Kee-lahr) ; b. 17 July 1932 in Lwów, Poland) is a Polish classical and film music composer.

Wojciech Kilar is one of Poland’s esteemed composers. Born in 1932 in Lwów (now a city in Ukraine, it was part of Poland at the time). His father was a gynecologist and his mother was a theater actress. Kilar has spent most of his life since 1948 in the city of Katowice in Southern Poland, married (from April 1966 to November 2007) to Barbara Pomianowska, a pianist. Kilar was 22 years old when he met 18 year old Barbara, his future wife.

Kilar studied at some of Poland's finest music academies, including the State Higher School of Music in Katowice, under the composer and pianist Władysława Markiewiczówna, graduating with top honors in 1955. He continued his post-graduate studies at the State Higher School of Music in Kraków from 1955 to 1958 under composer and pianist Bolesław Woytowicz. In 1957 he participated in the International New Music Summer Course in Darmstadt. Kilar expanded on his musical education in Paris in 1959-60, when a scholarship from the French government allowed him to study composition under Nadia Boulanger.