Double tonguing was developed to increase the speed at which a player could re-articulate a series of notes. From the time of Arban to the performances of Herbert L. Clark the technique was practiced and improved to the point where these musicians were able to accomplish fantastic performances of extremely difficult solos. The level at which they entertained their audiences was amazing. Many of these techniques have been lost or at least ignored and few modern players spend the required time developing these techniques. There are exceptions to this statement as illustrated by this video of