The Beatles never truly got back together.
At least during John Lennon's lifetime, that is, having acrimoniously called it a day in 1970 after a decade together.
Of course, they were dubbed 'The Threatles' when Paul McCartney, George Harrison and Ringo Starr reunited in 1994 to revitalise Lennon's long-lost demos for 'Free As A Bird' and 'Real Love'.
Once the band split, each of the members would fraternise with one another in some way and contribute to each other's albums in some way.
With the exception of John and Paul that is, due to their ongoing dispute which boiled over into thinly veiled digs at one another in songs like Paul's 'Too Many People' and John's scathing 'How Do You Sleep At Night?'.
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Collaboration post-Beatles was more of a frequent occurrence with Ringo however, as John, Paul, and George were happily pursuing their own creative ambitions.
Focusing on his acting career initially after The Beatles broke up, Ringo released two albums of covers, but by 1973 had changed his mind.
Source: Thomas Curtis-Horsfall/goldradiouk.com