Giovanni Gualberto Magli was an Italian castrato who had an active singing career during the first quarter of the 17th century.
 Born in Florence, he studied voice with Giulio Caccini before becoming a musician for the House of Medici on 23 August 1604.
 He participated in the world premiere of Claudio Monteverdi's "L'Orfeo" in 1607 at the court of Prince Francesco IV Gonzaga, Duke of Mantua, portraying the roles of La Musica and Proserpina and possibly one other part.
 The musicologist and historian Hans Redlich mistakenly allocates Magli to the role of Orfeo.
 In 1608 he sang for the wedding festivities of Cosimo II de' Medici, Grand Duke of Tuscany and Archduchess Maria Maddalena of Austria.
 In October 1611 he was granted two years paid leave by Antonio de' Medici to pursue further studies in Naples.
 He left Medici service in 1615 to join the musicians at the court of John Sigismund, Elector of Brandenburg.
 He remained there until September 1622.
 He was buried in Florence on 8 January 1625.
Euridice is an opera in a prologue and one act by the Italian composer Giulio Caccini.
 The libretto, by Ottavio Rinuccini, had already been set by Caccini's rival Jacopo Peri in 1600.
 Caccini's version of "Euridice" was first performed at the Pitti Palace, Florence on 5 December 1602.
 Caccini hurriedly prepared the score for the press and published it six weeks before Peri's version appeared.
Il rapimento di Cefalo ("The Abduction of Cephalus") was one of the first Italian operas. Most of the music was written by Giulio Caccini but Stefano Venturi del Nibbio, Luca Bati and Piero Strozzi also contributed.
 The libretto, by Gabriello Chiabrera, is in a prologue, five scenes and an epilogue and is based on the Classical myth of Cephalus and Aurora.
Settimia Caccini (6 October 1591 – ca. 1638, Italy) was a well-known Italian singer and composer during the 1600s being one of the first women to have a successful career in music.
 Caccini was highly regarded for her artistic and technical work with music.
 Settimia comes from a family of well-known composers and singers, with her father being Giulio Caccini one of the more famed composers of this time known for helping to establish monodic music.
 This type of music opposed traditional music then, by having expressive melodies and evocative chords.
 As well as her father being into music she also had an older sister who was a famous composer of the time.
 Although she is not as well known as her sister, Francesca Caccini, mostly due to the fact Settimia never published any of her own music composed pieces of music.
 Instead she was known much more for her talent as a singer, who sang for nobility across Italy.
 It is thought that she did compose her own music but instead of publishing and releasing it to be performed instead she kept it for herself for her to perform in private.
 One of her pieces eventually did get published once she had passed.
 Coming from a family full of talent her works are not as well known as her sister's compositions but nonetheless she was able to lead herself to her own fame and success.
Euridice (also Erudice or Eurydice) is an opera by Jacopo Peri, with additional music by Giulio Caccini.
 It is the earliest surviving opera, Peri's earlier "Dafne" being lost.
 (Caccini wrote his own "Euridice" even as he supplied music to Peri's opera, published this version before Peri's was performed, in 1600, and got it staged two years later.)
 The libretto by Ottavio Rinuccini is based on books X and XI of Ovid's "Metamorphoses"
Giacomo Benvenuti (16 March 1885, Toscolano — 20 January 1943, Barbarano-Salò) was an Italian composer and musicologist.
 He was the son of organist Cristoforo Benvenuti and studied at the Liceo Musicale in Bologna under Luigi Torchi (musicology) and Marco Enrico Bossi (organ).
 In 1919 his collection of songs for voice and piano accompaniment, "Canti a una voce : con accompagnamento di pianoforte", was published in Bologna.
 In 1922 he published a collection of 17th-century art songs entitled "35 Arie di vari autori del secolo XVII".
 Composer Samuel Barber studied the works of Giulio Caccini, Andrea Falconieri, and other early Italian composers under his tutelage in Milan in 1933-1934.
 For the Teatro dell'Opera di Roma he adapted Claudio Monteverdi's "L'Orfeo" for a production which premiered on 27 December 1934.
 The adaptation was later used for the first recording of "L'Orfeo" in 1939, which included a performance by the orchestra of La Scala Milan under conductor Ferrucio Calusio.
Peter Philips (also "Phillipps", "Phillips", "Pierre Philippe", "Pietro Philippi", "Petrus Philippus"; "c."1560–1628) was an eminent English composer, organist, and Catholic priest exiled to Flanders.
 He was one of the greatest keyboard virtuosos of his time, and transcribed or arranged several Italian motets and madrigals by such composers as Lassus, Palestrina, and Giulio Caccini for his instruments.
 Some of his keyboard works are found in the "Fitzwilliam Virginal Book".
 Philips also wrote many sacred choral works.
Stefano Venturi del Nibbio (fl.
 1592–1600) was an Italian composer of the late Renaissance, active in Venice and Florence.
 In addition to composing madrigals in a relatively conservative style, works which were published as far away as England, he collaborated with Giulio Caccini on one of the earliest operas, "Il rapimento di Cefalo" (1600).
Francesca Caccini (18 September 1587 – after 1641) was an Italian composer, singer, lutenist, poet, and music teacher of the early Baroque era.
 She was also known by the nickname "La Cecchina", originally given to her by the Florentines and probably a diminutive of "Francesca".
 She was the daughter of Giulio Caccini.
 Her only surviving stage work, "La liberazione di Ruggiero", is widely considered the oldest opera by a woman composer.
Giulio Romolo Caccini (also Giulio Romano) (8 October 1551 – buried 10 December 1618), was an Italian composer, teacher, singer, instrumentalist and writer of the very late Renaissance and early Baroque eras.
 He was one of the founders of the genre of opera, and one of the most influential creators of the new Baroque style.
 He was also the father of the composer Francesca Caccini.

Question: What is the occupation that both Giulio Caccini and Peter Philips have?
Answer: composer