Final answer:
The Get Back sessions were intended to document the Beatles' songwriting process and prepare for a live concert, which later also led to a Beatles documentary.
Step-by-step explanation:
The Get Back sessions primarily intended to document the songwriting process of the Beatles. Contrary to common belief, the aim wasn't initially to showcase how a band breaks up, which is an interpretation that only emerged later due to the tensions visible in the footage. While it did lead to a documentary about the Beatles, the core purpose was to film rehearsals and preparation for a live concert, capturing the creation of new music and providing insight into the band's dynamic during that time.