Amy Winehouse, the young British chanteuse with a classic sound that finds a home somewhere between Motown and Trojan records, easily created the biggest buzz thus far. For some reason her 6 p.m. slot in the miniscule Gobi tent, which resulted in thousands of fans spilling out into Coachella’s walking arteries, wasn’t in a larger locale — but so be it. Beyond any logistical performance her set showed that the hype was well deserved. Backed by a nine-piece band that featured horns and backup singers, Winehouse proved that she’s way ahead of “American Idol” and a lot closer to the Aretha Franklins and Diana Ross’ of the world. It will be interesting to see what she does in the future.