You can condition yourself to use your favorite music as a creative trigger, as well as a filter for environmental noise, and if you put it on your iPod or MP3 CD player, you'll always have it at hand.
Concrete ideas to modify and expand this hack go here.
Freeform discussion of this hack goes here.
Errata go here.
This is a page for a hack from the book MindPerformanceHacks by Ron Hale-Evans.