Home recordings, aka "The Kirchherr Tape"

From The Beatles Encyclopedia: Everything Fab Four:

In April 1960, the Beatals gathered at the McCartneys’ Liverpool home at 20 Forthlin Road, where they recorded demos for eight songs on a Grundig reel-to-reel tape recorder that McCartney had borrowed from Charles Hodgson. Known as the Kirchherr Tape, the surviving copy of the April 1960 recordings was given by Stuart Sutcliffe to his fiancée Astrid Kirchherr. In 1994, she presented it to Harrison. In a November 1994 interview with Mark Lewisohn, McCartney recalled that “sometimes I’d borrow a tape recorder, a Grundig with a little green eye, and we’d sort of go ’round to my house and try and record things… But those were very much home demos. Very bad quality“.

The April 1960 demos represent some of the band’s earliest rehearsals with Sutcliffe, who had been struggling with the bass since joining the group. Recorded in the McCartneys’ bathroom, the demos include several meandering, largely shapeless instrumentals, and the band’s percussion was contributed by McCartney’s brother Mike. […]

The tape includes some 50 minutes’ worth of music, and while most of it is valuable simply for its historical merits alone, the instrumental, “Cayenne” credited to McCartney, offers a genuinely haunting piece.