A carillon (/ˈkærɨlɒn/, /ˈkærɨljɒn/, or /kəˈrɪljən/; French: [kaʁijɔ̃]) is a musical instrument that is typically housed in a bell tower, or the belfry of a church or other municipal building. The instrument consists of at least 23 cast bronze, cup-shaped bells, which are played serially to play a melody, or sounded together to play a chord. A carillon is played by striking a keyboard - the keys of which are sometimes called batons - with the fists, and by pressing the keys of a pedal keyboard with the feet. The keys mechanically activate levers and wires that connect to metal clappers that strike the inside of the bells, allowing the performer on the bells, or carillonneur, to vary the intensity of the note according to the force applied to the key.

The carillon is the heaviest of all extant musical instruments; the total weight of bells alone can be 100 tons in the largest instruments.

The greatest concentration of carillons is still found in the low countries in Europe: the Netherlands, Belgium, and Northern France, where they were symbols of civic pride and status. Some of the most spectacular are now protected by UNESCO as part of the world heritage site the Belfries of Belgium and France.

Stefani Joanne Angelina Germanotta (/ˈstɛfəniː dʒʌrməˈnɑːtə/ STE-fə-nee jurr-mə-NAH-tə; born March 28, 1986), known by her stage name Lady Gaga, is an American singer and songwriter. Born and raised in New York City, she primarily studied at the Convent of the Sacred Heart and briefly attended New York University's Tisch School of the Arts before withdrawing to focus on her musical career. She began performing in the rock music scene of Manhattan's Lower East Side, and was signed with Streamline Records by the end of 2007. During her employment as a songwriter for the record company, her vocal abilities captured the attention of recording artist Akon, who signed her to his label Kon Live Distribution.

Lady Gaga came to prominence as a recording artist following the release of her debut album The Fame (2008), which was a critical and commercial success that topped charts around the world and included the international number-one singles "Just Dance" and "Poker Face". After embarking on the The Fame Ball Tour, she followed the album with The Fame Monster (2009), which spawned the worldwide hit singles "Bad Romance", "Telephone" and "Alejandro". The album's success allowed her to embark on the eighteen-month long Monster Ball Tour, which later became one of the highest-grossing concert tours of all time. Her most recent album Born This Way (2011) topped the charts of most major markets and generated more international chart-topping singles, including "Born This Way", "Judas" and "The Edge of Glory". Besides her musical career, she involves herself with humanitarian causes and LGBT activism.

Ennio Morricone, Grand Officer OMRI, Italian pronunciation: [ˈɛnnjo morriˈkoːne], (born November 10, 1928) is an Italian composer and conductor, who has written music for more than 500 motion pictures and television series, in a career lasting over 50 years. His scores have been included in over 20 award-winning films as well as several symphonic and choral pieces. Morricone is most famous for his work in the Spaghetti Westerns directed by his friend Sergio Leone, including A Fistful of Dollars (1964), For a Few Dollars More (1965), The Good, the Bad and the Ugly (1966), and Once Upon a Time in the West (1968) but his career includes a wide range of composition genres making him one of the film world's most versatile artists. He is considered as one of the most influential film music composers of the 20th century.

Born in Rome, Italy, Morricone took up the trumpet as a child and attended the National Academy of Santa Cecilia to take lessons on the instrument at the age of nine. He formally entered a conservatory at the age of 12, enrolling in a four-year harmony programme. He received his trumpet diploma in 1946 and started working professionally, composing the music to "Il Mattino" ("The Morning"). Morricone soon gained popularity by writing his first background music for radio dramas and quickly moved into film.

John Milton Cage Jr. (September 5, 1912 – August 12, 1992) was an American composer, music theorist, writer, and artist. A pioneer of indeterminacy in music, electroacoustic music, and non-standard use of musical instruments, Cage was one of the leading figures of the post-war avant-garde. Critics have lauded him as one of the most influential American composers of the 20th century. He was also instrumental in the development of modern dance, mostly through his association with choreographer Merce Cunningham, who was also Cage's romantic partner for most of their lives.

Cage is perhaps best known for his 1952 composition 4′33″, which is performed in the absence of deliberate sound; musicians who present the work do nothing aside from being present for the duration specified by the title. The content of the composition is not "four minutes and 33 seconds of silence," as is sometimes assumed, but rather the sounds of the environment heard by the audience during performance. The work's challenge to assumed definitions about musicianship and musical experience made it a popular and controversial topic both in musicology and the broader aesthetics of art and performance. Cage was also a pioneer of the prepared piano (a piano with its sound altered by objects placed between or on its strings or hammers), for which he wrote numerous dance-related works and a few concert pieces. The best known of these is Sonatas and Interludes (1946–48).