Stringvision Bow Grip musical Anakin's Theme (from STAR WARS:

Anakin's Theme (from STAR WARS: THE PHANTOM MENACE)

and even in metal bands

Here Comes Santa Claus (Right Down Santa Claus Lane)

Fiddlerman recommended

Stringvision Bow Grip musical Anakin's Theme (from STAR WARS:The Stringvision Bowgrip is a bow frog covering with a thumb indent. The advantages are primarily ergonomic (anti fatigue), but the Bowgrip also offers protection to the bow and instrument. The Bowgrip fits over all sizes of violin, viola, and cello bows, including most fractional size bows. The Stringvision Bowgrip is used by professionals and educators and offers several advantages not afforded by any other string instrument accessory: The Bowgrip