The Beatles shaped popular music in many different ways. For a start, they wrote all their own hits and most of their other recordings. Their early albums contained covers but their later ones did not. In the pre-Beatles age, specialist songwriters normally wrote the songs, it being assumed that performers didn't have time. While the Beatles were not the first to write their own songs (Hank Williams and Buddy Holly are earlier examples that spring immediately to mind), the level of their success made it much easier for those that followed. The Beatles were so good at writing songs that they had too many to release as singles, allowing others to have hits with their songs though this compilation is, of course, limited to their own hits.
The Beatles had so many number one hits in Britain and America that some were left out, the main omission being Strawberry fields forever. It was on the same single as Penny Lane but both sides were credited as A-sides. The coupling only made number two in Britain but made number one in America. Another omission is Please please me, which made number one in three British charts but not the one most commonly used these days, in which it peaked at number two. The omission of these tracks is less controversial than the alternative - editing other tracks to make room for them. Imagine the furore if that had been done.
So we are left with twenty-seven of the best Beatles songs that made number one in Britain or America, often both. Some of the differences are fascinating. Love me do, their first UK single, barely made the UK top twenty and wasn't released in America until a year and a half later, following the success of other singles. Eight days a week and Yesterday were not released as UK singles at the time. Yesterday became a UK top ten hit for Matt Monro. The Beatles' version eventually made the UK top ten in the seventies. Eight days a week was given to Alma Cogan who made a brilliant recording of it but it didn't chart for her or anybody else in the UK.
As an introduction to Beatles music, this is outstanding but it should leave you wanting more - much more.