Why is it that the guitar solo of the national anthem that Jimi Hendrix did at Woodstock is still considered one of the best solos of all time?

Why-is-it-that-the-guitar-solo-of-the-national-anthem-that-Jimi-Hendrix-did-at-Woodstock-is-still-considered-one-of-the-best-solos-of-all-time