MUSIC ----- MIXFest serves up snap, crackle, pop for all ages Music Review/by Linda Laban Sunday, September 22, 2002 MIXFest, with Pink, Def Leppard, John Mayer, Avril Lavigne, at the FleetCenter, last night. What on Earth could 17-year-old skater pop princess Avril Lavigne possibly have in common with middle-aged soft-metalers Def Leppard? Besides both appearing at WBMX-FM's MIXFest 2002 at the FleetCenter last night, that is? Diverse as they are, both acts know how to spin out a pop- toned hit. Indeed, the link between all seven artists on the bill was a canny knack with hummable, memorable tunes. True to its name, Mix-98.5's six-hour annual celebration, co-sponsored by the Herald, culled artists from the United States, Ireland, Canada and the United Kingdom. The show fused varying nationalities as well as musical attitudes - just as long as those included a strong melody and a persuasive backbeat. Ending a long evening, Def Leppard, its glory days long since past, dragged out too many middling songs, including ``Now'' from its ballad-heavy new CD ``X,'' which is out Tuesday. Even catchy, chart-busting '80s hits like ``Animal'' seemed dulled by time. Among a handful of covers, Pink, now a brunette, also pulled out an '80s hit: her powerful cover of 4-Non Blondes ``What's Going On.'' Played with her well- oiled band, her funky samba ``Get the Party Started,'' pop rant ``Mizzundastood,'' which included some racy antics with her female guitarist, and gorgeous ``My Vietnam'' were pure Pink. British singer-songwriter-guitarist David Gray, and his younger U.S. counterpart John Mayer, both backed by three-piece bands, put out the kind of full-bore electric performances that should forever banish them from the coffeehouse circuit. Ex-Berklee student Mayer, receiving ear-splitting cheers, moved from strumming his acoustic guitar during a pumped-up ``Your Body Is a Wonderland'' to a lilting solo that turned into quite a show of virtuosity. The rich-toned Gray, playing before Mayer, belted out songs from his breakthrough record ``White Ladder'' and beyond, swapping acoustic guitar for keyboards to end with a rave-cultured finale. Rushing the stage with her trio of guitarists while her drummer pounded out a fierce beat, the Canadian punk coquette Avril Lavigne pogoed through ``Sk8er Boi'' before nailing the show with the killer chorus of her power-pop ballad ``Complicated.'' Boston-based newcomers Rubyhorse - which hails from Ireland and mixes dance and Britpop accents with basic melodic rock - and beloved Beantown pop-rock veterans Guster delivered short, sharp sets (20 minutes each), high on energy and hooks. Something like the average pop hit in fact. © Copyright by the Boston Herald and Herald Interactive Advertising Systems, Inc.