Some context: ZZ Top  is an American rock band formed in 1969 in Houston, Texas. The band has, since 1970, consisted of bassist and lead vocalist Dusty Hill, guitarist and lead vocalist Billy Gibbons (the band's leader, main lyricist and musical arranger), and drummer Frank Beard. "As genuine roots musicians, they have few peers", according to former musician, critic and collector Michael "Cub" Koda. "Gibbons is one of America's finest blues guitarists working in the arena rock idiom [...] while Hill and Beard provide the ultimate rhythm section support."
ZZ Top's next album was even more successful. Eliminator, released in March 1983, featured two top 40 singles ("Gimme All Your Lovin'" and "Legs"), and two additional Top Rock hits ("Got Me Under Pressure" and "Sharp Dressed Man"), with "Legs" peaking at no. 13 on the Club Play Singles chart. Eliminator was a critical and commercial success, selling more than 10 million copies, and several music videos were in regular rotation on MTV. The band also won their first MTV Video Music Awards in the categories of Best Group Video for "Legs", and Best Direction for "Sharp Dressed Man". The music videos were included in their Greatest Hits video, which was later released on DVD and quickly went multiple-platinum. However, the Eliminator album was not without controversy. According to former stage manager David Blayney in his book "Sharp Dressed Men", sound engineer Linden Hudson co-wrote much of the material on the album while serving as a live-in high-tech music teacher to Beard and Gibbons. Despite continued denials by the band, it settled a five-year legal battle with Hudson, paying him $600,000 after he proved he held the copyright to the song "Thug".  Despite not selling as many copies as Eliminator, 1985's Afterburner became the band's highest-charting album, racking up sales of five million units. All of the singles from Afterburner were Top 40 hits, with two ("Sleeping Bag" and "Stages") hitting no. 1 on the Mainstream Rock chart. The music video for "Velcro Fly" was choreographed by pop singer Paula Abdul. ZZ Top's grueling Afterburner World Tour lasted well into 1987, which also saw the release of The ZZ Top Sixpack, a three-disc collection of ZZ Top's albums from 1970 to 1981, with the exception of Deguello. The albums ZZ Top's First Album, Rio Grande Mud, Tres Hombres, Fandango, and Tejas were remixed to have a more contemporary sound.  Recycler, released in 1990, was ZZ Top's last studio album under contract with Warner Records. Recycler was also the last of a distinct sonic trilogy in the ZZ Top catalogue, marking a return towards a simpler guitar-driven blues sound with less synthesizer and pop bounce than the previous two albums. This move did not entirely suit the fan base that Eliminator and Afterburner had built up, and while Recycler did achieve platinum status, it never matched the sales of those albums.
what song did they release
A: ("Gimme All Your Lovin'" and "Legs"),

Some context: Francisco Pizarro was born in Trujillo, Caceres, Spain (then in the Crown of Castile) in modern-day Extremadura, Spain. He was the illegitimate son of infantry colonel Gonzalo Pizarro (1446-1522) and Francisca Gonzalez, a woman of poor means. His date of birth is uncertain, but it is believed to be sometime in the 1470s, probably 1474. Little attention was paid to his education and he grew up illiterate.
On 10 November 1509, Pizarro sailed from Spain to the New World with Alonso de Ojeda on an expedition to Uraba. He sailed to Cartagena and joined the fleet of Martin Fernandez de Enciso and, in 1513, accompanied Balboa to the Pacific. In 1514, he found a supporter in Pedro Arias Davila, the Governor of Castilla de Oro and was rewarded for his role in the arrest of Balboa with the positions of mayor and magistrate in Panama City, serving from 1519 to 1523.  Reports of Peru's riches and Cortes's success in Mexico tantalized Pizarro. He undertook two expeditions to conquer the Incan Empire in 1524 and in 1526. Both failed as a result of native hostilities, bad weather and lack of provisions.  Pedro de los Rios, the Governor of Panama, made an effort to recall Pizarro, but the conquistador resisted and remained in the south. In April 1528, he reached northern Peru and found the natives rich with precious metals. This discovery gave Pizarro the motivation to plan a third expedition to conquer the area. He returned to Panama to make arrangements, but the Governor refused to grant permission for the project. Pizarro returned to Spain to appeal directly to King Charles I. His plea was successful and he received not only a license for the proposed expedition, but also authority over any lands conquered during the venture. He was joined by family and friends and the expedition left Panama in 1530.  When hostile natives along the coast threatened the expedition, Pizarro moved inland and founded the first Spanish settlement in Peru, San Miguel de Piura. Atahualpa refused to tolerate a Spanish presence in his lands, but was captured by Pizarro during the Battle of Cajamarca on 16 November 1532. A ransom for the emperor's release was demanded and Atahualpa filled a room with gold, but Pizarro charged him with various crimes and executed him on 26 July 1533, overriding his associates who thought he was overstepping his authority. The same year, Pizarro entered the Inca capital of Cuzco and completed his conquest of Peru. In January 1535, Pizarro founded the city of Lima, a project he considered his greatest achievement. Quarrels between Pizarro and his longtime comrade-in-arms Diego Almagro culminated in the Battle of Las Salinas. Almagro was captured and executed and, on 26 June 1541, his embittered son, Diego de Almagro "el mozo", assassinated Pizarro in Lima. The conquistador of Peru was laid to rest in the Lima Cathedral.
What discovery motivated him?
A:
In April 1528, he reached northern Peru and found the natives rich with precious metals.