Problem: Background: Sherbet (aka Highway or The Sherbs) was one of the most prominent and successful Australian rock bands of the 1970s. The 'classic line-up' of Daryl Braithwaite on vocals, Tony Mitchell on bass guitar, Garth Porter on keyboards, Alan Sandow on drums, and Clive Shakespeare on guitar provided their teen-orientated pop style. In 1976 Shakespeare left and was soon replaced by Harvey James. Sherbet's biggest singles were "Summer Love" (1975) and "Howzat" (1976), both reaching number one in Australia. "
Context: Sherbet was formed in Sydney in April 1969 by Dennis Laughlin on vocals (ex-Sebastian Hardie Blues Band, Clapham Junction), Doug Rea on bass guitar (Downtown Roll Band), Sammy See on organ, guitar and vocals (Clapham Junction), Clive Shakespeare on lead guitar and vocals (Downtown Roll Band), and Danny Taylor on drums (Downtown Roll Band). Initially they were a soul band playing Motown covers and rock-based material. Alan Sandow (ex-Daisy Roots) replaced Taylor on drums by July. Sherbet signed to the Infinity Records label - a subsidiary of Festival Records. The band's debut single was issued in March 1970 as a cover version of Badfinger's "Crimson Ships" - from that band's January 1970 album Magic Christian Music. During 1970 the band played a residency at Jonathon's Disco, playing seven hours a night, four days a week for eight months. They were spotted by their future manager, Roger Davies. By March Daryl Braithwaite (Bright Lights, House of Bricks, Samael Lilith) had joined, initially sharing lead vocals with Laughlin who left the band a few months later. Braithwaite's former band mate Bruce Worrall (Bright Lights, House of Bricks, Samael Lilith) took over from Rea on bass guitar. By year's end the group undertook their first national tour. See had left in October to join The Flying Circus and was replaced by New Zealand-born Garth Porter (Samael Lilith, Toby Jugg) who provided Hammond organ and electric piano. In 1971, Sherbet entered Australia's prestigious national rock band contest, Hoadley's Battle of the Sounds, and won the New South Wales final but lost the national final to Adelaide-based band Fraternity (led by Bon Scott later in AC/DC). They entered again in 1972 and won the national final, previous winners include The Twilights (1966) and The Groove (1968), which went on to achieve major commercial success. Sherbet's first chart hits on the Go-Set National Top 40 were covers of Blue Mink's "Can You Feel It Baby?" (September 1971), Delaney and Bonnie's "Free the People" (February 1972) and Ted Mulry's "You're All Woman" (September 1972). Most of their early recordings were produced by Festival's in-house producer Richard Batchens, who later produced albums and singles for another Infinity label mate, Richard Clapton. The band increased its profile with prestigious support slots on major tours by visiting international acts including Gary Glitter and The Jackson 5.
Question: Did they make a concerts or tour in this years?
Answer: The band increased its profile with prestigious support slots on major tours by visiting international acts including Gary Glitter and The Jackson 5.

Background: Vasco da Gama was born in 1460 or 1469 in Sines, on the southwest coast of Portugal, probably in a house near the church of Nossa Senhora das Salas. Sines, one of the few seaports on the Alentejo coast, consisted of little more than a cluster of whitewashed, red-tiled cottages, occupied chiefly by fisherfolk. Vasco da Gama's father was Estevao da Gama, who had served in the 1460s as a knight of the household of Infante Ferdinand, Duke of Viseu. He rose in the ranks of the military Order of Santiago.
Context: From the earlier part of the 15th century, Portuguese expeditions organized by Prince Henry the Navigator had been reaching down the African coastline, principally in search of west African riches (notably, gold). They had greatly extended Portuguese maritime knowledge, but had little profit to show for the effort. After Henry's death in 1460, the Portuguese Crown showed little interest in continuing this effort and, in 1469, sold off the neglected African enterprise to a private Lisbon merchant consortium led by Fernao Gomes. Within a few years, Gomes' captains expanded Portuguese knowledge across the Gulf of Guinea, doing business in gold dust, Melegueta pepper, ivory and sub-Saharan slaves. When Gomes' charter came up for renewal in 1474, Prince John (future John II), asked his father Afonso V of Portugal to pass the African charter to him. Upon becoming king in 1481, John II of Portugal set out on many long reforms. To break the monarch's dependence on the feudal nobility, John II needed to build up the royal treasury; he considered royal commerce to be the key to achieving that. Under John II's watch, the gold and slave trade in west Africa was greatly expanded. He was eager to break into the highly profitable spice trade between Europe and Asia, which was conducted chiefly by land. At the time, this was virtually monopolized by the Republic of Venice, who operated overland routes via Levantine and Egyptian ports, through the Red Sea across to the spice markets of India. John II set a new objective for his captains: to find a sea route to Asia by sailing around the African continent. By the time Vasco da Gama was in his 20s, the king's plans were coming to fruition. In 1487, John II dispatched two spies, Pero da Covilha and Afonso de Paiva, overland via Egypt to East Africa and India, to scout the details of the spice markets and trade routes. The breakthrough came soon after, when John II's captain Bartolomeu Dias returned from rounding the Cape of Good Hope in 1488, having explored as far as the Fish River (Rio do Infante) in modern-day South Africa and having verified that the unknown coast stretched away to the northeast. An explorer was needed who could prove the link between the findings of Dias and those of da Covilha and de Paiva, and connect these separate segments into a potentially lucrative trade route across the Indian Ocean.
Question: What was the most profitable trade?
Answer:
To break the monarch's dependence on the feudal nobility, John II needed to build up the royal treasury;