Problem: Background: Thomas Sowell (; born June 30, 1930) is an American economist, social theorist, political philosopher, and author. He is currently Senior Fellow at the Hoover Institution, Stanford University. Sowell was born in North Carolina, but grew up in Harlem, New York.
Context: Sowell has also written a trilogy of books on ideologies and political positions, including A Conflict of Visions, where he speaks about the origins of political strife; The Vision of the Anointed, where he compares the conservative/libertarian and liberal/progressive worldviews; and The Quest for Cosmic Justice, where, as in many of his other writings, he outlines his thesis of the need for intellectuals, politicians and leaders to fix and perfect the world in utopian, and ultimately he posits, disastrous fashions. Separate from the trilogy, but also in discussion of the subject, he wrote Intellectuals and Society, where, building on his earlier work, he discusses what he argues to be the blind hubris and follies of intellectuals in a variety of areas. Sowell challenges the notion that black progress is due to progressive government programs or policies, in The Economics and Politics of Race, (1983), Ethnic America (1981), Affirmative Action Around the World (2004), and other books. He claims that many problems identified with blacks in modern society are not unique, either in terms of American ethnic groups, or in terms of a rural proletariat struggling with disruption as it became urbanized, as discussed in his book Black Rednecks and White Liberals (2005). In Affirmative Action Around the World Sowell holds that affirmative action covers most of the American population, particularly women, and has long since ceased to favor blacks. Sowell described his serious study of Karl Marx in his autobiography. He opposes Marxism, providing a critique in his book Marxism: Philosophy and Economics (2011). Sowell also favors decriminalization of all drugs.
Question: How did his books sale
Answer:

Background: Primal Scream are a Scottish rock band originally formed in 1982 in Glasgow by Bobby Gillespie (vocals) and Jim Beattie. The current lineup consists of Gillespie, Andrew Innes (guitar), Martin Duffy (keyboards), Simone Butler (bass) and Darrin Mooney (drums). Barrie Cadogan has toured and recorded with the band since 2006 as a replacement after the departure of guitarist Robert "Throb" Young. The band performed throughout 1982-1984, but their career did not take off until Gillespie left his position as drummer of The Jesus and Mary Chain.
Context: Their first recording session, for McGee's independent label Essential Records, was a single track entitled "The Orchard", with Judith Boyle on vocals. Beattie later claimed that they burned the master tape. After the aborted recording, Gillespie joined The Jesus and Mary Chain as their drummer, and alternated between the two bands. While the Mary Chain became notorious for their chaotic gigs, Gillespie and Beattie expanded Primal Scream's lineup to include schoolfriend Young on bass, rhythm guitarist Stuart May, drummer Tom McGurk, and tambourine player Martin St. John. This lineup was signed to Creation Records, an independent record label founded by Alan McGee, and recorded the group's debut single, "All Fall Down", which received positive reviews. After the release of the single, Gillespie was told by Mary Chain leaders William and Jim Reid that he was to either dissolve Primal Scream to join the Mary Chain full-time or resign. Gillespie chose to remain with Primal Scream. Stuart May was replaced by Paul Harte, and the group then released a new single, "Crystal Crescent". The b-side, "Velocity Girl", was released on the C86 compilation, which led to their being associated with the scene of the same name. The band strongly disliked this, with Gillespie saying that "they can't play their instruments and they can't write songs." The band toured throughout 1986, and Gillespie became disenchanted with the quality of their performances. He said that there "was always something missing, musically or in attitude." The band switched to McGee's newly set-up Warner Bros. subsidiary Elevation Records. Before the band entered Rockfield Studios in Wales to record their debut album, McGurk was asked to leave the band. The group subsequently began recording using session players. They spent four weeks recording with producer Stephen Street before deciding to halt the sessions. May was subsequently dismissed and Gillespie's former bandmate Innes was brought in as his replacement, and the band finally found a new drummer, Gavin Skinner. With their new lineup, the band re-entered the studio, this time in London with producer Mayo Thompson. By the time Sonic Flower Groove was completed, it had cost PS100,000. The album reached number 62 on the British charts and received poor reviews, with AllMusic calling it "pristine but dull." The backlash from the album caused internal strife within the band. Beattie and Skinner subsequently resigned. The band, now consisting of only Gillespie, Innes and Young, relocated to Brighton to regroup. Young switched to guitar, and they recruited bassist Henry Olsen and drummer Phillip "Toby" Tomanov, who had both been in Nico's backing band, The Faction. They traded in their jangle pop sound for a harder rock edge, or as Gillespie said, "[w]e had found rock 'n' roll." The band re-signed to Creation Records and released their first single in two years, "Ivy, Ivy, Ivy". This was followed by a full album, Primal Scream. The band's new sound was met with poor reviews, NME called it "confused and lacking in cohesion". Fans responded as unfavourably as the critics, with many of the old fans being disappointed or simply confused by the new sound. The album featured Felt keyboardist Martin Duffy guesting.
Question: Did their musical style change with the new members?
Answer:
They traded in their jangle pop sound for a harder rock edge,