They both have been lead singers for the Jayhawks. Mark left the band after marrying Victoria Williams and forming the Creekdippers. After Mark left, Gary took over (he was singing back-up and playing guitar). Rumors are that the Jayhawks broke up, now these two are touring solo doesn't help the rumors. I hope the rumors are false! Thanks for the compliment, maybe someday screwball press and arthouse 60 can do a co-lab?
C'mon now. I showed in a group show that had Derek as a guest artist here in Indianapolis. He's a cool guy and very down to earth. He's got some great work, I admire him for doin' his thang! Individual style is just that, variation is subjective.