The Bowline knot is one of the most useful used in the entertainment industry. It makes a loop of any size at one end of a rope. It is easy to tie and untie. This is the knot used by the riggers on the ground to tie the cable and shackles to the rope the up-riggers drop from above in arenas.

Two much shorter videos on tying a Bowline.

Advanced Bowlines. This video shows a great selection of enhanced Bowline knots.