Here's an interesting thread, on another forum:
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An excerpt from one of my favorite posts:
Ringo has nearly perfect tempo. This allowed the Beatles to record a song 50 or 60 times, and then be able to edit together different parts of numerous takes of the same song for the best possible version. Today an electronic metronome is used for the same purpose, but the Beatles had to depend on Ringo to keep the tempo consistant throughout the dozens of takes of the songs that you know and love so well. Had he not had this ability, the Beatles recordings would sound completely different today.
Ringo's "feel" for the beat serves as a standard for pop-rock record producers and drummers alike. It is relaxed, but never dragging. Solid, yet always breathing. And yes, there is a great amount of musical taste in his decisions of what to play and when to play it. In most recording sessions, the drummer's performance acts as a barometer for the rest of the musicians. The stylistic direction, dynamics, and emotions are filtered through the drummer. He is the catcher to whom the pitcher/songwriter is throwing. If the drumming doesn't feel good, the performance of any additional musicians is doomed from the start. The Beatles rarely if ever had this problem with Ringo.
Ringo hated drum solos, which should win points with quite a few people. He only took one solo while with the Beatles. His eight measure solo appears during "The End" on the "B" side of Abbey Road. Some might say that it is not a great display of technical virtuosity, but they would be at least partially mistaken. You can set an electronic metronome to a perfect 126 beats per minute, then play it along with Ringo's solo and the two will stay exactly together.
Ringo's ability to play odd time signatures helped to push popular songwriting into uncharted areas. Two examples are "All you Need is Love" in 7/4 time, and "Here Comes the Sun" with repeating 11/8, 4/4, and 7/8 passages in the chorus.
Ringo's proficiency in many differen styles such as two beat swing ("When I'm Sixty-Four"), ballads ("Something"), R&B ("Leave My Kitten Alone" and "Taxman") and country (the Rubber Soul album) helped the Beatles to explore many musical directions with ease. His pre-Beatle experience as a versatile and hard working nightclub musician served him well.