Answer the question at the end by quoting:

Zheng He (Chinese: Zheng He ; 1371-1433 or 1435) was a Chinese mariner, explorer, diplomat, fleet admiral, and court eunuch during China's early Ming dynasty. He was originally born as Ma He in a Muslim family, later adopted the conferred surname Zheng from Emperor Yongle. Zheng commanded expeditionary voyages to Southeast Asia, South Asia, Western Asia, and East Africa from 1405 to 1433. His larger ships stretched 120 meters or more in length.
Zheng He's sailing charts, the Mao Kun map, were published in a book entitled the Wubei Zhi (A Treatise on Armament Technology) written in 1621 and published in 1628 but traced back to Zheng He's and earlier voyages. It was originally a strip map 20.5 cm by 560 cm that could be rolled up, but was divided into 40 pages which vary in scale from 7 miles/inch in the Nanjing area to 215 miles/inch in parts of the African coast.  Investigation into folios 19V to 20R of the Mao Kun Map which covers the Indian Ocean including the South India, Sri Lanka, the Maldives, and East Africa suggests that it is a composite of four maps, one for Sri Lanka, one for South India one for the Maldives and one for around 400 km of the East African coast, no further south than 6 degrees south of the Equator. Each of these maps is positioned at a different orientation to fit with the ocean currents and winds required of a sailing chart, rather than a formal map. The analysis also suggests that Arabic-speaking pilots with a detailed knowledge of the African coast were involved in the cartography.  There is little attempt to provide an accurate 2-D representation; instead the sailing instructions are given using a 24-point compass system with a Chinese symbol for each point, together with a sailing time or distance, which takes account of the local currents and winds. Sometimes depth soundings are also provided. It also shows bays, estuaries, capes and islands, ports and mountains along the coast, important landmarks such as pagodas and temples, and shoal rocks. Of 300 named places outside China, more than 80% can be confidently located. There are also fifty observations of stellar altitude.

Are his charts still used today?



IN: The Rolling Stones are an English rock band formed in London, England in 1962. The first stable line-up consisted of Brian Jones (guitar, harmonica), Mick Jagger (lead vocals), Keith Richards (guitar, backing vocals), Bill Wyman (bass), Charlie Watts (drums), and Ian Stewart (piano). Stewart was removed from the official line-up in 1963 but continued as a touring member until his death in 1985. Jones left the band less than a month before his death in 1969, having already been replaced by Mick Taylor, who remained until 1974.

Since their formation in 1962, the Rolling Stones survived multiple feuds and have gone on to release 30 studio albums, 13 live albums and 109 singles. According to OfficialCharts.com, the Stones are ranked the fourth bestselling group of all time, with their top single being "(I Can't Get No) Satisfaction", regarded by many at the time as "the classic example of rock and roll." The Stones have also contributed to the blues lexicon, creating their own "codewords" and slang, which they have used throughout their catalog of songs, including some of their more popular songs. The band has been viewed as the musical "vanguard of a major transfusion" of various cultural attitudes, making them accessible to youth in both America and Britain. Muddy Waters was quoted as stating that the Rolling Stones and other English bands enhanced the interest of American youth into blues musicians; after they came to the United States, sales of Waters' albums - and those of other blues musicians - increased with public interest, thus helping to reconnect the country with its own music.  The Rolling Stones have sold over 240 million albums worldwide and have held over 48 tours of varying length. The Stones have also held three of the highest grossing tours of all time, Bridges to Babylon, Voodoo Lounge, and A Bigger Bang. In May 2013, Rolling Stone declared them the "most definitional band that rock & roll has produced," with the Telegraph stating that Mick Jagger was "the Rolling Stone who changed music". The band has been the subject of numerous documentaries and were inducted into the Rock and Roll Hall of Fame by Pete Townshend in 1989. The Rolling Stones have inspired and mentored new generations of musical artists both as a band and individually. They are also credited with changing the "whole business model of popular music."  The band has received - and been nominated for - multiple awards during their 55 years as a band; including three Grammy awards (and 12 nominations), the Juno award for International Entertainer of the Year in 1991, U.K.'s Jazz FM Awards Album of the Year (2017) for their album Blue & Lonesome, and NME awards such as best live band and the NME award for best music film, for their documentary Crossfire Hurricane.

How did they change the business model?

OUT: