Problem: The Beatles were an English rock band formed in Liverpool in 1960. With members John Lennon, Paul McCartney, George Harrison and Ringo Starr, they became widely regarded as the foremost and most influential music band. Rooted in skiffle, beat and 1950s rock and roll, the Beatles later experimented with several musical styles, ranging from pop ballads and Indian music to psychedelia and hard rock, often incorporating classical elements and unconventional recording techniques in innovative ways. In 1963 their enormous popularity first emerged as "Beatlemania"; as the group's music grew in sophistication, led by primary songwriters Lennon and McCartney, the band were integral to pop music's evolution into an art form and to the development of the counterculture of the 1960s.

In Icons of Rock: An Encyclopedia of the Legends Who Changed Music Forever, Scott Schinder and Andy Schwartz describe the Beatles' musical evolution:  In their initial incarnation as cheerful, wisecracking moptops, the Fab Four revolutionised the sound, style, and attitude of popular music and opened rock and roll's doors to a tidal wave of British rock acts. Their initial impact would have been enough to establish the Beatles as one of their era's most influential cultural forces, but they didn't stop there. Although their initial style was a highly original, irresistibly catchy synthesis of early American rock and roll and R&B, the Beatles spent the rest of the 1960s expanding rock's stylistic frontiers, consistently staking out new musical territory on each release. The band's increasingly sophisticated experimentation encompassed a variety of genres, including folk-rock, country, psychedelia, and baroque pop, without sacrificing the effortless mass appeal of their early work.  In The Beatles as Musicians, Walter Everett describes Lennon and McCartney's contrasting motivations and approaches to composition: "McCartney may be said to have constantly developed - as a means to entertain - a focused musical talent with an ear for counterpoint and other aspects of craft in the demonstration of a universally agreed-upon common language that he did much to enrich. Conversely, Lennon's mature music is best appreciated as the daring product of a largely unconscious, searching but undisciplined artistic sensibility."  Ian MacDonald describes McCartney as "a natural melodist - a creator of tunes capable of existing apart from their harmony". His melody lines are characterised as primarily "vertical", employing wide, consonant intervals which express his "extrovert energy and optimism". Conversely, Lennon's "sedentary, ironic personality" is reflected in a "horizontal" approach featuring minimal, dissonant intervals and repetitive melodies which rely on their harmonic accompaniment for interest: "Basically a realist, he instinctively kept his melodies close to the rhythms and cadences of speech, colouring his lyrics with bluesy tone and harmony rather than creating tunes that made striking shapes of their own." MacDonald praises Harrison's lead guitar work for the role his "characterful lines and textural colourings" play in supporting Lennon and McCartney's parts, and describes Starr as "the father of modern pop/rock drumming".

Where did they perform?

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Problem: Panic! at the Disco is an American rock band from Las Vegas, Nevada, formed in 2004 and featuring the current lineup of vocalist Brendon Urie, accompanied on tour by guitarist Kenneth Harris, drummer Dan Pawlovich, and bassist Nicole Row. Founded by childhood friends Ryan Ross, Spencer Smith, Brent Wilson and Urie, Panic! at the Disco recorded its first demos while its members were in high school. Shortly after, the band recorded and released its debut studio album, A Fever You Can't Sweat Out (2005).

After the Vices & Virtues tour cycle, Urie, Smith, and Weekes began writing and preparing for a fourth album. During the recording of the album, touring guitarist Ian Crawford, who joined the band in 2009 after the departure of Ryan Ross and Jon Walker, left the band citing his desire to make "real, genuine" music. On July 15, 2013, the album was announced as Too Weird to Live, Too Rare to Die!, with a scheduled release date of October 8, 2013. The first single, "Miss Jackson", was released on July 15, 2013, along with its music video to promote the album. Panic! at the Disco opened for Fall Out Boy on the Save Rock And Roll Arena Tour with Kenneth Harris replacing Crawford.  Shortly before the band began its first tour in support of the album, Smith wrote an open letter to fans regarding his abuse of alcohol and prescription medications since the recording of Pretty. Odd. Although Smith joined the band for the first handful of dates, he left the tour to "continue fighting addiction". Urie posted on the band's official website on August 7, 2013, that "It's become evident that Spencer still needs more time to take care of himself. I can't expect him to be fighting addiction one minute and be fully immersed in a national tour the next. With that said, the tour will continue without Spencer while he is away getting the help he needs." Since Spencer's leave of absence, Dan Pawlovich of the band Valencia has filled in on tour.  In an interview with Pure Fresh on September 23, 2014, Urie stated that he had already thought about ideas on the fifth studio album; however, he was not sure if it would be a Panic! at the Disco album, or a solo album. Urie has also stated there are no current plans for Smith to return to the band.

When did his addiction start?

Answer with quotes:
his abuse of alcohol and prescription medications since the recording of Pretty. Odd.