The band first visited the United States in March 1967 to play nine dates at the RKO 58th Street Theatre in New York. There was little impact, as impresario Murray the K placed them at the bottom of a six-act bill that performed three times per date, eventually reducing the band to one song per concert. They returned to record Disraeli Gears in New York between 11 May and 15 May 1967. This, the band's second album, was released in November 1967 and reached the Top 5 in the charts on both sides of the Atlantic. Produced by Felix Pappalardi (who later co-founded the Cream-influenced quartet Mountain) and engineer Tom Dowd, it was recorded at Atlantic Studios in New York. Disraeli Gears is often considered to be the band's defining effort, successfully blending psychedelic British rock with American blues.  In addition to "Strange Brew" and "Tales of Brave Ulysses", Disraeli Gears features "Sunshine of Your Love," which became the group's unofficial anthem. Bruce and Pete Brown came upon the idea in a state of near desperation in the wee hours. In a last-ditch attempt to salvage something from the long and fruitless night at his apartment, the bleary-eyed Bruce pulled out his double bass again and played a riff. At that point, Brown looked out the window and saw the sun was about to rise: "It's getting near dawn ...," he said to himself. Brown put the words on paper then thought some more: "When lights close their tired eyes".  The album was originally slated for release in the summer of 1967, but the record label opted to scrap the planned cover and repackage it with a new psychedelic cover, designed by artist Martin Sharp, and the resulting changes delayed its release for several months. The album was remarkable for the time, with a psychedelic design patterned over a publicity photo of the trio.  Although the album is considered one of Cream's finest efforts, it has never been well represented in the band's live sets. Although they consistently played "Tales of Brave Ulysses" and "Sunshine of Your Love," several songs from Disraeli Gears were quickly dropped from performances in mid-1967, favouring longer jams instead of short pop songs. "We're Going Wrong" was the only additional song from the album the group performed live. In fact, at their 2005 reunion shows in London, the band played only three songs from Disraeli Gears: "Outside Woman Blues", "We're Going Wrong," and "Sunshine of Your Love"; at their three October 2005 performances in New York, "Tales of Brave Ulysses" was also included in the setlist.  In August 1967, they played their first headlining dates in the US, playing first at The Fillmore in San Francisco and later at The Pinnacle in Los Angeles. The concerts were a great success and proved very influential on both the band itself and the flourishing hippie scene surrounding them. Upon discovering a growing listening audience, the band began to stretch out on stage, incorporating more time in their repertoire, some songs reaching jams of twenty minutes. Long, drawn-out jams in numbers like "Spoonful", "N.S.U.", "I'm So Glad", and "Sweet Wine" became live favourites, while songs like "Sunshine of Your Love", "Crossroads", and "Tales of Brave Ulysses" remained reasonably short.

Answer this question "How did their style change?" by extracting the answer from the text above.
Disraeli Gears is often considered to be the band's defining effort, successfully blending psychedelic British rock with American blues.