2 selections from one of Jaki Liebezeit's practice cassettes. 
More info in the book: Jaki Liebezeit: Life, Theory and Practice of a Master Drummer
https://unbound.com/books/jaki-liebezeit/
"Jaki used cassettes as a notepad – a rehearsal tool, recording not just himself for reference but also the groups who would play together in his room.
He enjoyed the simplicity of one button each for record and playback and that there was no complex set up with microphones. 
He also experimented with the auto record levelling system of cheap recorders."

Jaki Cassette 9-02 Excerpt1 9 (4)

kumo