Why is it that Blues, proper R&B, and rock bands still remain popular at Bike Rallies?

You may go if you wish.
Remember this: Walk away now and you walk away from your crafts, your skills, your vocations; leaving the next generation with nothing but recycled, digitally-sampled techno-grooves, quasi-synth rhythms, pseudo-songs of violence-laden gansta-rap, acid pop, and simpering, saccarine, soulless slush.

Depart now and you forever separate yourselves from the vital American legacies of Robert Johnson, Muddy Waters, Willie Dixon, Jimmie Reed, Memphis Slim, Blind Boy Fuller, Louie Jordan, Little Walter, Big Walter, Sonnyboy Williamson I (and II), Otis Redding, Jackie Wilson, Elvis Pressley, Lieber and Stoller, and Robert K. Weiss.

Turn your backs now and you snuff out the fragile candles of Blues, R&B, and Soul, and when those flames flicker and expire, the light of the world is extinguished because the music which has moved mankind through seven decades leading to the millenium will whither and die on the vine of abandonment and neglect.

Elwood Blues