Cynthia and John Lennon had one son, Julian, together
The iconic London venue reveal comical historic dispute with the band
The Abbey Road Institute will offer 'training and education in audio engineering and music production'
Beck, Dave Grohl, Fall Out Boy and Tom Morello will all perform at event in April
Music's biggest names polled to discover their favourite songs by the Fab Four
The overhaul of the historic, Grade II listed studios will require planning permission
Tapes expected to fetch more than a million pounds at London auction
Collection will be sold over two year period
Promoter was pivotal in helping launch the Fab Four
Johns was unhappy with the involvement of producer Phil Spector