Background: The Vicomte of Bragelonne: Ten Years Later (French: Le Vicomte de Bragelonne ou Dix ans plus tard [l@ vikot d@ bRaZ@lon u diz_a ply taR]) is a novel by Alexandre Dumas.
Context: After 35 years of loyal service, d'Artagnan resigns as lieutenant of the Musketeers as he perceives the young king Louis XIV as weak-willed. He resolves to aid the exiled Charles II to retake the throne of England, unaware that Athos is attempting the same. With their assistance Charles II is restored to the throne and d'Artagnan is rewarded richly.  In France, Cardinal Mazarin has died, leaving Louis to assume power with Jean-Baptiste Colbert as his finance minister. Colbert has an intense hatred for his superior the king's Superintendent of Finances, Nicolas Fouquet, and tries to bring about his fall. He brings to the king's attention that Fouquet is fortifying his fief of Belle Ile secretly. Louis persuades d'Artagnan to re-enter his service, and tasks him to investigate Belle Ile, promising him a substantial salary and promotion to Captain of the King's Musketeers on his return. Louis, finally growing into a decisive ruler, also accepts an offer relayed by Athos from Charles II to marry his brother Philippe I, Duke of Orleans to Charles' sister Henrietta Anne Stuart.  D'Artagnan confirms that Belle Ile is being fortified and the architect ostensibly in charge is Porthos, though the blueprints show the handwriting of Aramis, who is now the bishop of Vannes. Aramis, suspicious of d'Artagnan, sends Porthos back to Paris to warn Fouquet, whilst tricking d'Artagnan into searching for Porthos around Vannes. Porthos warns Fouquet in the nick of time, and he cedes Belle Ile to the king, humiliating Colbert. On returning from the mission, d'Artagnan is made Captain of the King's Musketeers anyway.  Meanwhile, Princess Henrietta arrives in France escorted by the second Duke of Buckingham, to be met by an embassy consisting of Raoul de Bragelonne, his close friend Armand de Gramont, Comte de Guiche, and the Comte de Wardes, son of the previous Comte de Wardes from The Three Musketeers. The erratic Buckingham is madly in love with the princess and can scarcely conceal it, while Guiche soon finds himself equally smitten. Philippe, though little attracted to women, becomes horribly jealous of Buckingham and has him exiled after the wedding.
Question: Why would that make him resign?
Answer: 

Problem: Background: A musical ensemble, also known as a music group or musical group, is a group of people who perform instrumental or vocal music, with the ensemble typically known by a distinct name. Some music ensembles consist solely of instruments, such as the jazz quartet or the orchestra. Some music ensembles consist solely of singers, such as choirs and doo wop groups. In both popular music and classical music, there are ensembles in which both instrumentalists and singers perform, such as the rock band or the Baroque chamber group for basso continuo (harpsichord and cello) and one or more singers.
Context: The four-piece band is the most common configuration in rock and pop music.  Another common formation was a vocalist, electric guitarist, bass guitarist, and a drummer (e.g. The Who, The Monkees, Led Zeppelin, Queen, Ramones, Sex Pistols, Red Hot Chili Peppers, R.E.M., Blur, The Smiths, Echo and the Bunnymen, The Stone Roses, Creed, Black Sabbath, Van Halen, Rage Against the Machine, Gym Class Heroes, The Stooges, Joy Division, and U2.) Instrumentally, these bands can be considered as trios. This format is popular with new bands, as there are only two instruments that need tuning, the melody and chords formula prevalent with their material is easy to learn, four members are commonplace to work with, the roles are clearly defined and generally are: instrumental melody line, rhythm section which plays the chords or countermelody, and vocals on top.  In some early rock bands, keyboardists were used, performing on piano (e.g. The Seeds and The Doors) with a guitarist, singer, drummer and keyboardist. Some bands will have a guitarist, bassist, drummer, and keyboard player (for example, Talking Heads, Gerry and the Pacemakers, Small Faces, King Crimson, The Guess Who, Pink Floyd, Queen, Coldplay, The Killers and Blind Faith).  Some bands will have the bassist on lead vocals, such as Thin Lizzy, The Chameleons, Skillet, Pink Floyd, Motorhead, NOFX, +44, Slayer, The All-American Rejects or even the lead guitarist, such as Death, Dire Straits, Megadeth and Creedence Clearwater Revival. Some bands, such as The Beatles, have a lead guitarist, a rhythm guitarist and a bassist that all sing lead and backing vocals, that also play keyboards regularly, as well as a drummer.
Question: that have what?
Answer:
two instruments that need tuning, the melody and chords formula prevalent with their material is easy to learn,