Question: The phenomenon known as Beatlemania originated in the United Kingdom, birthplace of the Beatles, when the band first realised enormous popularity there in 1963, the Beatles achieved a commercial breakthrough with their second UK single release, "Please Please Me", a song and the second single released by English rock group the Beatles in the United Kingdom, and the first to be issued, in which country?

<P0-S0> The Beatles were an English rock band formed in Liverpool in 1960. <P0-S1>  With members John Lennon, Paul McCartney, George Harrison and Ringo Starr, they became widely regarded as the foremost and most influential act of the rock era. <P0-S2>  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. <P0-S3>  In 1963 their enormous popularity first emerged as "Beatlemania", and as the group's music grew in sophistication in subsequent years, led by primary songwriters Lennon and McCartney, they came to be perceived as an embodiment of the ideals shared by the counterculture of the 1960s. <SEP> <P1-S0> The phenomenon known as Beatlemania originated in the United Kingdom, birthplace of the Beatles, when the band first realised enormous popularity there in 1963. <P1-S1>  There followed an almost non-stop series of concerts and tours, attended with feverish enthusiasm across the UK, for the whole of the following year. <P1-S2>  Returning in 1962 from a highly formative two-year residency in Germany, the Beatles achieved a commercial breakthrough with their second UK single release, "Please Please Me" early in 1963, but gained "Superstar" status with the release of "She Loves You" later that year. <P1-S3>  The Beatles' popularity in the UK came to exceed even that of the notable American artists Tommy Roe, Chris Montez and Roy Orbison, whose UK chart success at the time did not keep them from being overshadowed by the Beatles during their 1963 nationwide tours with the lower-billed band — an achievement previously unknown for a UK act. <SEP> <P2-S0> "Do You Want to Know a Secret?" <P2-S1>  is a song by English rock group the Beatles from the 1963 album "Please Please Me", sung by George Harrison. <P2-S2>  In the United States, it was the first top ten song to feature Harrison as a lead singer, reaching No. 2 on the Billboard chart in 1964 as a single released by Vee-Jay, VJ 587. <SEP> <P3-S0>  It was also the title track of their first LP, which was recorded to capitalise on the success of the single. <P3-S1>  It was originally a John Lennon composition (credited to Lennon–McCartney), although its ultimate form was significantly influenced by George Martin. <P3-S2>  John Lennon: "Please Please Me is my song completely. <P3-S3>  It was my attempt at writing a Roy Orbison song, would you believe it? <P3-S4> "Please Please Me" is a song and the second single released by English rock group the Beatles in the United Kingdom, and the first to be issued in the United States. <P3-S5>  I wrote it in the bedroom in my house at Menlove Avenue, which was my auntie's place".