Quotes About Open strings

In fact, the particle-antiparticle annihilation and the closing of the string is necessary, if the theory is to be consistent with relativity, meaning the theory is required to have both open and closed strings. But this means it must include gravity. And the difference between gravity and the other forces is naturally explained, in terms of the difference between open and closed strings. For the first time, gravity plays a central role in the unification of the forces.

By adding open strings to even the simplest chords, you can create voicings that sound sophisticated, but are really easy (and fun) to play. They're practical, not intimidating, and most certainly don't sound like 'jazz chords.'