On Thursday London-based Apple Corps launched proceedings in the High Court in London and New York's Supreme Court against EMIRecords and Capitol Records, respectively.
Raised in a middle-class neighborhood in Johannesburg, South Africa, Calder never attended college but headed straight into the music business, playing bass guitar in local bands and working as a scout for EMIrecords.
In 1962, EMI signed the Beatles - now estimated to have sold more than one billion records worldwide - and the group's back catalogue is arguably its biggest asset.