OK, trashing someone else's vintage guitar on Fallon was dickish. $250 for a GA concert ticket raises eyebrows. You may question his new songs. But on this remake of his 1984 synth-rock signature, a promo for his new tour, Prince erases all doubts. Recast as a juke-joint grind that could knock the Black Keys to their knees, it spews Hendrixian napalm, then lurches into a monster jam on Edgar Winter's "Frankenstein." $250? If this is what's on offer, it's a bargain.