...by Jaco Pastorius.

I know, this vid is very long but this is the most enlighting, impressing, salutary interview / demonstration about bass playing as well as muisc in general I´ve seen for a long time.
He´s talking about his influences, his philosophy and understanding of music, about discipline and practicing,
he demonstrates a bunch of exercises, scales, techniques.
Also he plays a wonderful jazz solo piece and a great session with i.E. John Scofield. WOOOOWWWW!!

This vid is not only interestiung for bassmen but also for every musician / instrumentalist coz of his mindset in music generally.

Take time to watch, it´s worth

Superb - a true dedicated genius.
For those not interested in learning skip to about an hour and watch him pay in a three piece.

Did you notice how far he can bend back his thumb