The Beatles Experiments

Musically, four personnels of the most progressive band on the planet were able to fill each other weakness with each other talent. It makes their quality comparable to their popularity. Their musical journey with drama and urban legend which accompany it, has become fans consumption.

Although doing some cover songs in early albums, the Beatles were playing as a true ensemble. Recording the albums during a one-off live concert or a full concert tour. Then, they writing all of the songs by themselves. They stop touring to focus on their works by spending time in the studio, experimenting with music. Using studio artifice or multiple overdubbing. Often incorporating classical elements and unconventional recording techniques. 

Songwriting partnership between John Lennon and Paul McCartney which credited to Lennon–McCartney, almost dominate the tracks. While George Harrison's progressive guitar tunes and Ringo Starr's steady drum beats perfected the songs. 

Their existence and works have cultural impact. Some works in film, music, and literature got inspired from the Beatles works. Some of those works almost match the popularity of the Beatles. But, none of those works could compare the quality and spirituality in the original material.